道路標識世界
401. 車両検査
車両検査は、車両が安全で道路走行に適し、適用される技術・環境要件へ適合しているか確認する公的検査です。国・車種により、ブレーキ、タイヤ、操舵、サスペンション、灯火、排出ガス、車両識別などを確認します。検査規則と間隔は国によって異なり、定期検査に加え、大規模改造、事故、輸入、所有者変更後などに検査が必要な場合があります。
What is a vehicle inspection?
A vehicle inspection is an official examination of a vehicle to check whether it meets applicable safety, technical and environmental requirements.
What is checked during a vehicle inspection?
The inspection may include the brakes, tyres, steering, suspension, lights, vehicle identification and emissions. The exact inspection points depend on the country, vehicle type and type of inspection.
How often does a vehicle need to be inspected?
The inspection interval depends on the country and type of vehicle. Some countries require annual inspections, while others use longer intervals based on the vehicle's age, use or condition.
What happens if a vehicle fails the inspection?
A vehicle that does not meet the required standards may need to be repaired and presented for another inspection. Serious defects may restrict or prohibit the vehicle from being used until they are repaired.
Do all countries have the same vehicle inspection rules?
No. Vehicle inspection systems differ between countries, including which vehicles must be inspected, how often inspections are required and which technical standards are checked.
Do electric vehicles need a vehicle inspection?
In countries with periodic vehicle inspections, electric vehicles are generally also subject to inspection. Some inspection points differ because electric vehicles do not have a conventional combustion engine or exhaust-emission system.
402. 車両キー
車両キーは、車両を解錠し、作動を許可する装置です。従来は機械式の鍵でしたが、現代車では電子トランスポンダー、リモコンキー、キーレスシステムなどが一般的です。
多くはイモビライザーと連携し、認証済みキーを検知しない限りエンジンや駆動系を始動できません。そのため交換・複製キーは車両への電子登録が必要な場合があります。
What does a modern car key do?
A modern car key can unlock and lock the vehicle and authorise the engine or electric propulsion system to start. It may use a mechanical blade, electronic transponder, remote-control functions or a keyless system.
What is a transponder key?
A transponder key contains an electronic identification device that communicates with the vehicle's immobiliser. If the correct code is not recognised, the vehicle normally prevents the engine or propulsion system from being started.
What should you do if you lose a vehicle key?
Use a spare key if available and arrange a replacement through an appropriate dealer, locksmith or vehicle specialist. Modern replacement keys often need to be programmed to the vehicle's electronic security system.
403. ダッシュボード
ダッシュボードは、運転者前方にあり、車両の重要情報を表示し、操作装置や警告表示へアクセスできる部分です。速度計、燃料・バッテリー残量、警告灯、方向指示表示、エンジン、ブレーキ、安全システム情報などがあります。現代車では従来の計器の代わりにデジタルディスプレイを使用する場合があります。運転者は主要な表示記号を理解し、警告灯点灯時に適切に対応する必要があります。
What is a car dashboard?
The dashboard is the panel in front of the driver that displays vehicle information and contains controls, gauges and warning indicators.
What information is shown on the dashboard?
A dashboard may show the speed, fuel or battery level, engine information, warning lights, turn indicators and safety-system status. The exact display depends on the vehicle.
What do dashboard warning light colours mean?
Colours generally indicate the importance or function of a dashboard light. Red often indicates a serious warning, yellow or amber usually indicates caution, and green or blue commonly indicates that a system is active. Symbols and meanings can differ between vehicles, so consult the vehicle manual.
What should I do if a dashboard warning light comes on?
Identify the warning and follow the instructions in the vehicle manual. A red warning light may require you to stop safely as soon as possible, while other warnings may indicate that the vehicle should be checked or repaired.
What is the instrument cluster?
The instrument cluster is the part of the dashboard directly in front of the driver that contains the main gauges, displays and warning lights.
Can a dashboard be completely digital?
Yes. Many modern vehicles use a digital dashboard or digital instrument cluster that displays vehicle information on one or more electronic screens instead of traditional analogue gauges.
404. ワイパー
ワイパーは、フロントガラスから雨、雪、汚れ、水分などを取り除き、道路の明瞭な視界を保つ装置です。多くの車両は交換可能なゴムブレードを持つ電動ワイパーを備え、複数速度とウォッシャー液装置を組み合わせます。筋が残る、跳ねる、十分に拭き取れない場合は摩耗・損傷したブレードを交換します。
What is a windscreen wiper?
A windscreen wiper is a device that moves across the windscreen to remove rain, snow, dirt and moisture so the driver can maintain a clear view of the road.
Why are windscreen wipers important?
Windscreen wipers help maintain clear visibility in bad weather and when the windscreen becomes dirty. Poor visibility can make it harder to detect traffic, pedestrians, signs and hazards.
When should windscreen wiper blades be replaced?
Wiper blades should be replaced when they are worn, cracked, damaged or no longer clean the windscreen effectively. Common signs include streaking, skipping, squeaking or areas of the windscreen remaining wet.
What is the windscreen washer system?
The windscreen washer system sprays cleaning fluid onto the windscreen so the wipers can remove dirt and improve visibility.
Can you drive with broken windscreen wipers?
Driving with defective windscreen wipers can be unsafe and may be illegal where functioning wipers are required. The driver must be able to maintain adequate visibility through the windscreen.
Do cars have a rear window wiper?
Many vehicles have a rear window wiper, especially hatchbacks, estate cars and SUVs. Whether one is fitted or legally required depends on the vehicle design and applicable regulations.
405. ドア
ドアは車両への出入りを可能にし、走行中の乗員保護にも役立ちます。正しく開閉し、走行中は確実に閉じ、ヒンジ、ラッチ、ロック機構が正常に作動する必要があります。損傷・緩みがあり突然開く、または適切に閉じられないドアは重大な安全リスクになります。
Why are vehicle doors important for safety?
Vehicle doors help protect occupants and keep them safely inside the vehicle. They should close securely and must not open unexpectedly while driving.
What parts of a vehicle door should work correctly?
The door, hinges, catches, locking mechanism and surrounding structure should be secure and in good condition so the door can open and close properly.
Can you drive with a door that does not close properly?
A door that cannot remain securely closed can be dangerous and may make the vehicle unroadworthy. It should be repaired before the vehicle is used.
Are sliding doors checked differently from normal doors?
The basic requirement is the same: the door must open and close correctly and remain securely closed. The exact inspection method can depend on the type of door and vehicle.
Can damaged door hinges be dangerous?
Yes. Damaged, loose or badly worn hinges can prevent a door from closing correctly or allow it to move unexpectedly.
406. グローブボックス
グローブボックスは、助手席前のダッシュボードに組み込まれた収納スペースです。車両書類、取扱説明書、小物などを手の届く場所に保管するため使われます。走行中は閉じておき、乗員を妨げたり物が落ちたりしないようにします。貴重品や、駐車中の高温で損傷する物の保管は避けます。
What is a glovebox?
A glovebox is a storage compartment in the dashboard, usually located in front of the passenger seat. It is also called a glove compartment.
Why is it called a glovebox?
The name comes from the early use of the compartment for storing driving gloves. Today it is commonly used for vehicle documents and other small items.
What can you keep in a glovebox?
A glovebox is commonly used for vehicle documents, the owner’s manual and small useful items. What should be kept in the vehicle depends on local legal requirements and personal preference.
Should the glovebox be closed while driving?
Yes. Keeping the glovebox properly closed while driving prevents it from obstructing the passenger area and helps stop loose objects from falling out.
Should valuables be kept in the glovebox?
It is generally better not to leave valuable or sensitive items in an unattended vehicle, as a glovebox does not provide strong protection against theft.
Can a glovebox become hot?
Yes. The interior of a parked vehicle can become very hot, and the glovebox can also heat up. Avoid storing heat-sensitive or potentially dangerous items there.
407. 視界
視界は、運転者が道路、他の道路利用者、危険を明瞭に見られ、同時に車両が他者から見える状態を指します。暗闇、霧、雨、雪、汚れ・曇りのある窓、まぶしさ、視野を遮る物などで低下します。窓、ミラー、灯火を清潔に保ち、視野を妨げる物を除き、視界低下時は適切な灯火を使用します。
What does visibility mean when driving?
Visibility describes how clearly a driver can see the road, traffic and hazards and how easily other road users can see the vehicle.
What can reduce visibility while driving?
Visibility can be reduced by darkness, fog, rain, snow, glare, dirty or misted windows and objects that obstruct the driver’s view.
How can you improve visibility while driving?
Keep the windscreen, windows, mirrors and lights clean, remove condensation or ice before driving and use the appropriate lights when conditions require them.
Can objects inside a vehicle obstruct visibility?
Yes. Objects placed on the dashboard, windscreen or elsewhere around the driver can block part of the field of vision and make it harder to detect road users or hazards.
What should you do when visibility is poor?
Reduce your speed, increase your following distance and use the appropriate lights. Make sure you can see far enough ahead to react safely to traffic and obstacles.
Why are mirrors important for visibility?
Mirrors extend the driver’s view to the rear and sides of the vehicle. They should be clean and correctly adjusted, although drivers must still check blind spots where necessary.
408. 雪
雪は道路を滑りやすくし、視界を低下させ、停止距離を大幅に増加させます。速度を下げ、車間距離を増やし、加速、操舵、制動を滑らかに行って制御喪失を防ぎます。走行前に窓、ミラー、灯火の雪や氷を除去し、国や道路状況により適切なタイヤや冬季装備が必要です。
How does snow affect driving?
Snow can reduce tyre grip, visibility and vehicle control and increase the distance needed to slow down or stop.
How should you drive on snow?
Drive more slowly, increase your following distance and use smooth acceleration, steering and braking. Sudden movements can cause the tyres to lose grip.
Should snow be removed from a vehicle before driving?
Yes. Remove snow and ice that obstruct the windscreen, windows, mirrors and lights. Snow should also be removed where it could fall from the vehicle and create a hazard for other road users.
Are winter tyres required when it snows?
This depends on the country. Some countries require winter tyres during certain periods or winter conditions, while others only recommend them.
When are snow chains used?
Snow chains can provide additional grip on roads covered with snow or ice. Rules for their use vary between countries, and some roads may require them when indicated by a traffic sign.
Should you use fog lights during snowfall?
Fog-light rules vary by country. They are generally intended for conditions where snow, fog or other weather significantly reduces visibility, so drivers should follow the applicable local rules.
409. 氷結
氷結は道路を非常に滑りやすくし、タイヤグリップ、操舵、制動性能を大幅に低下させます。特に薄く透明なブラックアイスは見つけにくいことがあります。速度を下げ、車間距離を増やし、加速、操舵、制動を滑らかに行います。橋、日陰の道路など、周囲が乾いて見えても氷が残りやすい場所では特に注意します。
Why is ice dangerous when driving?
Ice can cause a major loss of tyre grip, making it harder to steer, brake or accelerate without skidding.
What is black ice?
Black ice is a thin, transparent layer of ice that can be difficult to distinguish from the road surface. It is particularly dangerous because drivers may not notice it until the vehicle begins to lose grip.
How should you drive on an icy road?
Reduce speed, increase your following distance and use smooth steering, acceleration and braking. Avoid sudden movements that could cause the tyres to lose grip.
Where is ice most likely to form on a road?
Ice can form anywhere temperatures are sufficiently low, but drivers should be particularly careful on bridges, shaded sections, exposed roads and areas where water collects.
What should you do if the vehicle starts to skid on ice?
Remain calm, avoid sudden braking or steering and make smooth corrections while reducing the forces that caused the loss of grip. The correct response can depend on the vehicle and its safety systems.
Do winter tyres improve grip on ice?
Winter tyres can provide better grip in cold and winter conditions than summer tyres, although no tyre can eliminate the risk of skidding on ice. Requirements for winter tyres vary between countries.
410. 雨
雨は、視界、タイヤグリップ、車両制御を低下させ、停止距離を増やします。路面の水により、タイヤが路面との接触を失うハイドロプレーニングが起こることもあります。運転者は減速し、車間距離を増やし、急な操舵・制動を避け、視界が低下したら適切な灯火を使用します。大雨や、わだち・排水不良道路に水がたまる場所では特に注意します。
How does rain affect driving?
Rain can reduce visibility and tyre grip, increase stopping distances and make it more difficult to control the vehicle safely.
What is aquaplaning?
Aquaplaning occurs when a layer of water builds up between the tyres and the road, causing the tyres to lose contact with the road surface and reducing steering and braking control.
How should you drive in heavy rain?
Reduce speed, increase your following distance and use smooth steering, acceleration and braking. Use the appropriate lights and be prepared for reduced visibility and standing water.
Why should you increase the following distance in rain?
Wet roads can increase the distance needed to stop. A larger following distance gives you more time and space to react safely.
What should you do if the vehicle starts aquaplaning?
Remain calm, ease off the accelerator and avoid sudden braking or steering. Make smooth corrections until the tyres regain contact with the road.
Should you use headlights in rain?
Lighting requirements vary between countries. Drivers should use the lights required by local traffic rules whenever rain or other conditions reduce visibility.
411. 着氷性の雨
着氷性の雨は、過冷却された雨滴が冷たい道路、車両、その他の表面へ触れた瞬間に凍り、薄い氷膜を作る現象です。路面が凍っているように見えなくても非常に滑りやすくなります。減速し、車間距離を増やし、急な加速、操舵、制動を避けます。橋、日陰、未処理道路は特に危険になりやすく、降り続くと状況が急変します。
What is freezing rain?
Freezing rain is rain that freezes when it reaches a sufficiently cold surface, forming a layer of ice on roads, vehicles and other objects.
Why is freezing rain dangerous for drivers?
Freezing rain can create very slippery and difficult-to-see ice, greatly reducing tyre grip and making steering and braking more difficult.
Is freezing rain the same as snow?
No. Snow falls as frozen crystals, while freezing rain falls as liquid droplets that freeze when they reach a cold surface.
Can freezing rain cause black ice?
Yes. Freezing rain can create a thin, transparent layer of ice that is difficult to distinguish from a wet road and is often described as black ice.
How should you drive in freezing rain?
Reduce speed, increase your following distance and use smooth acceleration, steering and braking. Avoid unnecessary driving if conditions become extremely slippery.
Where is freezing rain most dangerous?
Extra caution is needed on bridges, exposed roads, shaded areas and untreated surfaces, where ice may form quickly or remain longer.
412. 霧
霧は視界を大幅に低下させ、速度、距離、他の道路利用者の位置を判断しにくくします。運転者は減速し、車間距離を増やし、他者を眩惑しない適切な灯火を使います。前車だけを目印にせず、視界が突然変化することにも備えます。非常に濃い霧では、安全な場所へ停止することが最善の場合があります。
Why is fog dangerous when driving?
Fog can greatly reduce visibility and make it harder to judge speed, distance and the movement of other road users.
How should you drive in fog?
Reduce speed, increase your following distance and use the appropriate lights. Drive so that you can stop safely within the distance you can clearly see.
Should you use high-beam headlights in fog?
Usually not. High beams can reflect from the water droplets in fog and make visibility worse. Use the lighting permitted and recommended under local traffic rules.
When should fog lights be used?
Fog lights are intended for conditions where fog or similar weather significantly reduces visibility. The exact rules for front and rear fog lights vary between countries.
Should you follow the lights of the vehicle ahead in fog?
No. You should maintain your own safe speed and following distance. Following another vehicle too closely can be dangerous because visibility and stopping distance remain limited.
What should you do if fog becomes extremely dense?
If visibility becomes too poor to continue safely, slow down and consider stopping at a safe place away from moving traffic until conditions improve.
413. ひょう
ひょうは、視界を低下させ、路面を滑りやすくし、突然危険な運転条件を作ります。道路上にたまると氷や小石のようにタイヤグリップを低下させ、大きなひょうはフロントガラスや車体を損傷することもあります。減速し、車間距離を増やし、急な操舵・制動を避け、状況が激しい場合は安全な場所へ停止して通過を待つことを検討します。
Why is hail dangerous when driving?
Hail can reduce visibility and tyre grip, make the road slippery and distract drivers because of the sudden noise and impact of hailstones.
How should you drive during a hailstorm?
Reduce speed, increase your following distance and use smooth steering and braking. If the hail becomes severe or visibility is very poor, consider stopping at a safe place away from moving traffic.
Can hail make a road slippery?
Yes. Hailstones can collect on the road and create a slippery surface with reduced tyre grip, particularly when mixed with rain or melting ice.
Can hail damage a vehicle?
Yes. Large hailstones can damage windscreens, windows, mirrors and vehicle bodywork. Severe hail can also reduce visibility if glass becomes cracked or damaged.
Should you use headlights during hail?
Use the lights required by local traffic rules when hail or other weather reduces visibility. Lighting requirements vary between countries.
Is it safer to stop during severe hail?
If visibility or road conditions become too dangerous, it may be safer to stop at a suitable place away from moving traffic and continue when conditions improve.
414. 日光
日光は、太陽が低い位置にある場合や、濡れた道路、雪、建物、他車から強い光が反射する場合に視界を低下させます。まぶしさにより信号、標識、歩行者などを見つけにくくなることがあります。必要に応じて減速し、フロントガラスを清潔に保ち、サンバイザーや適切なサングラスを使用し、一時的に隠れた危険へ対応できる余裕を持ちます。
Why can sunlight be dangerous when driving?
Bright or low sunlight can cause glare and temporarily reduce visibility, making traffic lights, signs, pedestrians and other road users more difficult to see.
When is sun glare most likely to cause problems?
Glare is often strongest when the sun is low in the sky, particularly around sunrise and sunset, and when sunlight reflects from wet roads, snow, glass or other bright surfaces.
What should you do when sunlight makes it difficult to see?
Reduce speed and increase your following distance so you have more time to react. Use the sun visor where helpful and avoid continuing at a speed that is too high for the available visibility.
Can a dirty windscreen make sun glare worse?
Yes. Dirt, grease, dust and streaks on the glass can scatter bright sunlight and make glare much worse. Keep the windscreen clean inside and outside.
Can sunglasses help while driving in bright sunlight?
Suitable sunglasses can reduce glare and improve visual comfort in bright conditions. They should not be so dark that they significantly reduce visibility, especially when entering tunnels or shaded areas.
Does a sun visor improve visibility?
Yes. A correctly positioned sun visor can block direct sunlight without unnecessarily obstructing the driver’s view of the road.
415. サングラス
サングラスは、特に太陽が低い場合や濡れた道路、雪などから反射する明るい光の中で、まぶしさを減らし視覚的快適性を高めます。信号、標識、他の道路利用者が明瞭に見えるレンズを選びます。非常に濃いレンズはトンネル、夜間、明るさが変化する状況で視界を低下させるため、安全に見えにくくなる場合は外します。
Can sunglasses help when driving?
Yes. Sunglasses can reduce glare and improve visual comfort in bright sunlight, making it easier to see the road and surrounding traffic.
When are sunglasses most useful while driving?
They are particularly useful when the sun is low in the sky or when bright light reflects from wet roads, snow, glass or other surfaces.
Are very dark sunglasses suitable for driving?
Very dark lenses can reduce the amount of light reaching the eyes and may make it difficult to see in tunnels, shade, poor weather or at night. Sunglasses should not interfere with safe visibility.
Can you wear sunglasses at night?
Sunglasses generally reduce available light and can therefore make it harder to see at night. They should not be worn when they significantly reduce visibility.
Are polarised sunglasses useful for driving?
Polarised lenses can reduce reflections from roads and other flat surfaces, but they may make some digital displays or screens harder to read. Drivers should make sure all essential instruments remain clearly visible.
Should sunglasses be removed when entering a tunnel?
If the lenses make the darker environment difficult to see, remove the sunglasses when it is safe to do so. Drivers should always maintain adequate visibility as lighting conditions change.
416. 凍結防止剤(塩)
塩は、冬季の道路で凍結防止・融氷のため一般的に使われます。水の凍結温度を下げ、氷の形成を防ぐ、または既存の雪や氷を溶かすのに役立ちます。道路管理者は乾燥塩、湿塩、塩水などを凍結前や凍結中に散布します。塩で安全性は向上しますが、大雪、着氷性の雨、極低温では処理済み道路でも危険なため、速度を下げ状況へ適応します。
Why is salt used on roads in winter?
Salt helps lower the freezing point of water, making it harder for ice to form and helping existing snow or ice melt.
What is the difference between deicing and anti-icing?
Anti-icing means treating the road before ice forms, while deicing means applying salt or another treatment after snow or ice is already present.
What is road brine?
Brine is a solution of salt and water that can be sprayed onto roads before freezing conditions occur. It helps the salt begin working quickly and can reduce ice formation.
Does salt make an icy road completely safe?
No. Salt can improve grip by reducing snow and ice, but treated roads can still be slippery. Drivers should continue to reduce speed and increase their following distance.
Does road salt work in every temperature?
No. The effectiveness of salt decreases as temperatures become very low. Road authorities may use different treatments or methods depending on the weather and road conditions.
Can road salt damage a vehicle?
Repeated exposure to road salt can contribute to corrosion of metal parts, particularly underneath the vehicle. Washing accumulated salt from the vehicle can help reduce this effect.
417. エアコン
エアコンは、車内の温度と湿度を調整し、快適性と視界を改善します。暑い時は室内を冷やし、湿気が多い時は空気中の水分を除いて窓の曇りを早く取るのに役立ちます。車内外の温度差が極端にならないよう適切に使い、十分に機能するよう整備します。
What does air conditioning do in a car?
Air conditioning cools and dehumidifies the air inside the vehicle, helping improve comfort and reduce moisture on the windows.
Can air conditioning help demist the windscreen?
Yes. Because air conditioning removes moisture from the air, it can help clear condensation from the windscreen and windows more quickly.
Should air conditioning be used in winter?
Yes. Air conditioning can still be useful in winter because it reduces humidity inside the vehicle and can help demist the windows.
Does air conditioning increase fuel or energy consumption?
Yes. Operating the air-conditioning system requires energy and can increase fuel or electricity consumption, although the effect depends on the vehicle, system and conditions.
Should a car's air conditioning be maintained?
Yes. Regular use and maintenance can help keep the system effective. A poorly functioning system may cool less efficiently or fail to remove moisture properly.
Can you drive without air conditioning?
Yes, in many vehicles and countries air conditioning itself is not required. However, the driver must still maintain adequate visibility and safe conditions inside the vehicle.
418. ハイドロプレーニング
ハイドロプレーニング(aquaplaning)は、タイヤと路面の間に水膜ができてタイヤが路面との接触を失う現象です。操舵、制動、加速が大幅に効きにくくなります。速度、滞水、摩耗タイヤで危険が高まります。大雨時は減速し、急な操舵・制動を避け、十分な溝深さのある良好なタイヤを使用します。
What is hydroplaning?
Hydroplaning occurs when water separates the tyres from the road surface, reducing or temporarily removing normal tyre grip.
What causes hydroplaning?
The risk increases with higher speed, standing water, worn tyres and insufficient tyre tread. Tyre pressure and road conditions can also affect the risk.
How can you reduce the risk of hydroplaning?
Reduce speed in heavy rain, avoid driving through deep standing water where possible and keep your tyres properly maintained with sufficient tread depth.
What should you do if your vehicle starts hydroplaning?
Remain calm, ease off the accelerator and avoid sudden braking or steering. Keep the steering movements smooth and controlled until the tyres regain contact with the road.
Can worn tyres increase the risk of hydroplaning?
Yes. Tyre grooves help move water away from the contact area. Worn tyres can remove less water, increasing the risk of losing grip on a wet road.
At what speed does hydroplaning occur?
There is no single speed at which hydroplaning always begins. The risk depends on speed, water depth, tyre condition, tyre pressure and the road surface.
419. 路面の浮き砂利
路面の浮き砂利は、道路工事や表面処理後などに路面へ残る小石や砂利です。タイヤグリップを低下させ、制動距離を増やし、通過車両によって飛び上がってフロントガラスや他車を傷つけることがあります。減速し、車間距離を増やし、急な加速、制動、操舵を避け、他車のタイヤから石が飛ぶ可能性がある場合はさらに間隔を取ります。
What are loose chippings?
Loose chippings are small stones or pieces of gravel lying loose on the road surface, often after resurfacing or road maintenance.
Why are loose chippings dangerous?
Loose stones can reduce tyre grip and vehicle control and may be thrown into the air by tyres, potentially damaging windscreens or other vehicles.
How should you drive on loose chippings?
Reduce speed, increase your following distance and avoid sudden acceleration, braking or steering. Keep additional space from other vehicles where stones may be thrown up by their tyres.
Can loose chippings increase stopping distance?
Yes. Loose material between the tyres and road can reduce available grip, making braking and steering less effective.
Why are loose chippings common after roadworks?
Some road-surfacing methods use a layer of small stone aggregate. Until the material settles or excess stones are removed, loose chippings may remain on the surface.
Can loose chippings damage a vehicle?
Yes. Stones thrown up by tyres can cause chips or cracks in windscreens, headlights and vehicle paintwork.
420. 死角
死角は、運転者が直接またはミラーで見ることのできない車両周囲の区域です。車両の大きさ・設計によって異なり、トラック、バスなど背の高い大型車では特に広くなります。運転者はミラーを正しく調整し、車線変更、右左折、発進前に車両側方を確認します。自転車、歩行者、オートバイ利用者も大型車の運転者から見えない位置に長く留まらないようにします。
What is a blind spot?
A blind spot is an area around a vehicle that cannot be seen directly by the driver or adequately through the mirrors.
Do all vehicles have blind spots?
Yes. The size and position of blind spots depend on the vehicle design, mirrors and driver position. Large vehicles generally have larger blind spots than passenger cars.
How should you check a blind spot?
Adjust the mirrors correctly and, where necessary, make a brief direct check beside the vehicle before changing lanes, turning or moving away. The exact technique depends on the vehicle.
Why are truck blind spots dangerous?
Trucks can have large areas around the front, sides and rear that are difficult or impossible for the driver to see. Cyclists and pedestrians can therefore disappear from view even when they are close to the vehicle.
Can mirrors eliminate every blind spot?
No. Correctly adjusted mirrors can greatly improve visibility, but some areas may still remain difficult to see. Drivers should use all available mirrors and direct observation where appropriate.
Where should cyclists avoid riding near a truck?
Cyclists should avoid remaining directly beside, immediately in front of or close behind a large vehicle, particularly near intersections where the vehicle may turn.
421. 注意散漫
注意散漫は、安全な車両制御や道路観察から運転者の注意をそらすものです。携帯電話、ナビゲーション、乗客、飲食、操作装置の調整、道路から目を離す行為などが含まれます。視覚的、手動的、精神的な注意散漫があり、反応時間を大きく延ばす可能性があります。運転者は道路へ注意を集中し、ナビゲーションなどの設定は出発前に済ませ、安全運転を妨げる活動を避けます。
What is distracted driving?
Distracted driving occurs when a driver's visual, manual or mental attention is diverted from driving and the surrounding traffic.
What are common driving distractions?
Common distractions include mobile phones, navigation systems, passengers, eating, adjusting vehicle controls and looking away from the road.
Why is using a phone while driving dangerous?
Using a phone can combine visual, manual and mental distraction, reducing the driver's ability to notice hazards and react quickly.
Can hands-free phone use still be distracting?
Yes. Even when the driver's hands remain on the wheel, a conversation can create mental distraction and reduce attention to traffic.
Can a navigation system distract a driver?
Yes. Entering destinations or repeatedly looking at a screen can divert attention from the road. Set the route before driving whenever possible and use voice guidance where helpful.
How can you reduce distractions while driving?
Prepare navigation and vehicle settings before moving, secure loose objects, keep your phone away from unnecessary use and focus continuously on the road and traffic.
422. 感情
感情は、注意、判断、運転行動へ影響します。怒り、ストレス、恐怖、悲しみ、興奮などにより注意散漫、焦り、リスクを取る行動が起こりやすくなります。強い感情は集中力や反応時間にも影響します。自分の感情状態が安全運転を妨げていると感じたら、必要に応じて減速、休憩、安全な場所への停止を行い、落ち着いて注意深く続けられる状態になるまで待ちます。
Can emotions affect driving?
Yes. Strong emotions can affect attention, judgement, reaction time and decision-making, which can make safe driving more difficult.
Why is anger dangerous when driving?
Anger can lead to impatience, aggressive manoeuvres, speeding or reduced attention. Drivers should avoid reacting emotionally to other road users.
Can stress affect concentration while driving?
Yes. Stress can make it harder to focus on traffic and process information calmly, especially in complex or busy situations.
What should you do if you are too emotional to drive safely?
If your emotional state is affecting concentration or judgement, stop or delay the journey when possible and continue only when you feel able to drive safely.
Can excitement also be a distraction?
Yes. Positive emotions such as excitement can still reduce concentration or encourage impulsive behaviour if they take attention away from driving.
How can you stay calm while driving?
Allow enough travel time, avoid reacting to aggressive drivers, keep a safe distance and take a break when stress or frustration becomes difficult to manage.
423. ロードレージ
ロードレージは、交通中に他者へ向ける攻撃的、敵対的、威圧的な行動です。過度なクラクション、車間距離を詰める、怒鳴る、威嚇的ジェスチャー、進路妨害、意図的に攻撃的な運転操作などがあります。怒りは判断を低下させリスク行動を増やし、小さな交通上の対立を危険な状況へ発展させることがあります。対立を避け、落ち着き、安全な距離を保ち、攻撃的行動へ報復してはいけません。
What is road rage?
Road rage is aggressive, hostile or intimidating behaviour directed at other road users, often caused by anger or frustration in traffic.
What are examples of road rage?
Examples can include tailgating, excessive honking, shouting, threatening gestures, deliberately blocking another vehicle or aggressive overtaking and lane changes.
Why is road rage dangerous?
Anger can reduce judgement and encourage impulsive or risky driving, increasing the chance of collisions and escalating conflicts between road users.
What should you do if another driver becomes aggressive?
Stay calm, avoid confrontation, maintain a safe distance and do not retaliate or copy the other driver's behaviour. If necessary, move away from the situation when it is safe to do so.
Should you stop to confront an aggressive driver?
Generally, no. Confrontation can make the situation more dangerous. It is usually safer to remain in your vehicle and create distance from the aggressive road user.
How can you avoid road rage?
Allow enough travel time, accept that other road users make mistakes, avoid competing for road space and focus on reaching your destination safely rather than reacting emotionally.
424. 健康状態
健康状態は、安全運転能力へ影響することがあります。病気、けが、視力低下、運動能力低下、疲労、特定の医療状態、薬などは集中力、反応時間、判断、車両制御を妨げます。身体的・精神的状態が運転を危険にする可能性を認識し、必要なら医師へ相談します。国によっては特定の健康状態を申告し、医学検査や免許条件が必要です。
How can health affect driving?
Health problems can affect vision, concentration, reaction time, judgement, coordination and vehicle control, making safe driving more difficult.
Should you drive when you are ill?
Not if the illness makes it difficult to concentrate, react quickly or control the vehicle safely. Drivers should delay the journey or seek medical advice when necessary.
Can medication affect driving?
Yes. Some medicines can cause drowsiness, dizziness, blurred vision or slower reactions. Always follow the instructions provided with the medicine and advice from a healthcare professional.
Can poor eyesight affect driving?
Yes. Good vision is essential for recognising traffic signs, road users, hazards and changes in traffic conditions. Many countries set minimum eyesight requirements for drivers.
Can a medical condition affect a driving licence?
Yes. Depending on the country and condition, a driver may need a medical assessment, licence restriction or adapted vehicle before being permitted to drive.
Who is responsible for deciding whether someone is fit to drive?
This depends on local law. The driver usually has a responsibility to ensure they are fit to drive, while doctors or specialised assessment centres may evaluate driving fitness when required.
425. てんかん
てんかんは、意識、運動、感覚、認知などに変化を生じる反復性発作を起こすことがある神経疾患です。発作中は一時的に車両を安全に制御できなくなるため、運転適性と免許要件へ影響します。規則は国によって異なり、発作の種類、発作がない期間、治療、医学的評価などによって決まります。発作を経験した人は適用される運転規則に従い、再び運転する前に医療専門家へ相談します。
Can epilepsy affect your ability to drive?
Yes. A seizure can cause loss of awareness, consciousness or vehicle control, so epilepsy can affect whether a person is medically fit to drive.
Can a person with epilepsy have a driving licence?
In many countries, yes, provided specific medical and seizure-free requirements are met. The exact conditions depend on the country, licence category and individual medical situation.
What should you do after having a seizure?
Do not assume it is safe to continue driving. Seek medical advice and check the applicable driving-licence rules, because a temporary period without driving may be required.
Why is a seizure-free period required for driving?
A seizure-free period helps assess the risk of another seizure occurring while driving. The required period varies depending on the type and cause of the seizure and local regulations.
Can epilepsy medication affect driving?
Yes. Anti-seizure medicines can sometimes cause effects such as drowsiness, dizziness or reduced concentration. Changes in treatment can also affect seizure control, so medical advice should be followed.
Are driving rules stricter for professional drivers with epilepsy?
Usually, yes. Drivers of trucks, buses and vehicles used for certain professional transport generally face stricter medical fitness requirements because of the greater potential consequences of a seizure while driving.

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