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QuizTraffic rulesBelgium

Test your knowledge with our multiple-choice quiz. Learn from each answer and improve your understanding of the traffic rules and road signs of Belgium.

For informational purposes only. Always follow official regulations. Some content and images were created with AI assistance.

Traffic signs
Traffic rules
Belgium
True/false 17 Belgium 84 Car controls 109 Dashboard lights 40 Priority rules 9 Pedestrians 19 Cyclists 20 Driving licence 65 Show all 715
What should you do if the windscreen wipers stop working during heavy rain?

501. What should you do if the windscreen wipers stop working during heavy rain?

Continue slowly using the hazard lights.
✓ Reduce speed and stop in a safe place as soon as possible.
Open a side window and continue driving carefully.
Follow another vehicle closely so you can see its lights.

Do not continue when you cannot see clearly. Slow down smoothly and stop somewhere protected from traffic.

Windscreen wipers failing during heavy rain
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do when approaching a temporary lane closure?

502. What should you do when approaching a temporary lane closure?

Ignore the temporary signs if your lane is still open.
Follow construction vehicles through the closed lane.
✓ Follow the temporary signs and merge safely when required.
Merge without checking if traffic is moving slowly.

Observe the temporary signs, adjust your speed, and merge safely according to the traffic situation and local rules.

Temporary traffic-lane closure ahead
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should you keep the driver's footwell free of loose objects?

503. Why should you keep the driver's footwell free of loose objects?

They could block the footwell ventilation.
✓ They could roll into the pedals and interfere with control.
They could make it harder to adjust the driver's seat.
They could make the pedals noisier to operate.

Loose objects in the driver's footwell, such as bottles, cans, or rubbish, can roll into the pedal area and interfere with the accelerator, brake, or clutch. Keep the footwell clear so you can operate the pedals safely and without obstruction.

Loose objects in the driver's footwell
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do before driving if snow or ice covers your vehicle?

504. What should you do before driving if snow or ice covers your vehicle?

✓ Clear the windows, mirrors, lights, roof, and number plates.
Let the heater clear the ice while you drive.
Clear only the areas needed for your immediate view.
Clear only the windows and mirrors.

You need a clear view in every direction. Snow or ice left on the roof can also fall or blow onto other road users.

Clearing snow and ice from a vehicle before driving
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What is the minimum licence for a moped with a design speed over 25 and up to 45 km/h?

505. What is the minimum licence for a moped with a design speed over 25 and up to 45 km/h?

Licence A2.
Licence B.
No driving licence is required.
✓ Licence AM.

Category AM covers certain two- and three-wheeled mopeds with a maximum design speed above 25 km/h and not exceeding 45 km/h, as well as light quadricycles.

Moped with a design speed up to 45 km/h
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
When is parking prohibited because too little space remains for traffic?

506. When is parking prohibited because too little space remains for traffic?

✓ When less than three metres of the carriageway remains free.
Only when a bus is approaching.
When less than one metre remains free.
Never on a road without markings.

You may not park where doing so would leave less than three metres of free passage on the carriageway.

Parked vehicle restricting the space for passing traffic
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What does the SET function of cruise control normally do?

507. What does the SET function of cruise control normally do?

Switches cruise control off.
✓ Stores the current speed as the cruising speed.
Returns to a previously stored speed.
Applies the brakes automatically.

The SET function normally stores the vehicle's current speed as the cruise-control speed. Use it only when the road, traffic, and driving conditions are suitable.

SET button for storing a cruising speed
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What does this dashboard symbol indicate?

508. What does this dashboard symbol indicate?

✓ Low tyre pressure.
Brake-system warning.
Engine-management warning.
Power-steering warning.

This symbol indicates that one or more tyres may have low pressure. Check the tyre pressures and inspect the tyres for damage or a puncture.

Tyre-pressure warning symbol on the dashboard
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
When must cyclists riding side by side move into single file outside a built-up area?

509. When must cyclists riding side by side move into single file outside a built-up area?

✓ When a vehicle approaches them from behind.
Only when a bus approaches.
They never have to move into single file.
Whenever the road has a centre line.

Cyclists may generally ride side by side when this does not prevent vehicles from passing in the opposite direction. Outside built-up areas, they must also move into single file when a vehicle approaches from behind.

Cyclists riding side by side on a road
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Speed limits only apply when there is heavy traffic.

510. Speed limits only apply when there is heavy traffic.

✓ False.
True.

Speed limits apply at all times unless a different limit is clearly indicated.

Speed-limit sign beside a road
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Which selector position prevents drive being transmitted to the wheels?

511. Which selector position prevents drive being transmitted to the wheels?

✓ N (Neutral).
D (Drive).
P (Park).
R (Reverse).

Select N (Neutral) when drive should not be transmitted to the wheels. Unlike Park, Neutral does not lock the transmission to prevent the vehicle from rolling.

Automatic gear selector with P, R, N and D positions
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do when a bus signals to pull away from a bus stop?

512. What should you do when a bus signals to pull away from a bus stop?

Ignore the signal until the bus starts moving.
Accelerate and pass before the bus moves out.
✓ Slow down and be prepared to let it move out when safe.
Sound your horn so the bus waits for you.

Buses may pull away after picking up passengers. Slow down, check the traffic situation, and allow space when it is safe.

Bus signalling to pull away from a stop
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What may cyclists and speed-pedelec riders do at this red traffic light?

513. What may cyclists and speed-pedelec riders do at this red traffic light?

✓ Proceed in the direction shown after giving way to other road users.
Make a U-turn through the intersection.
Treat the red light as a green light for all traffic.
Proceed in every direction without checking.

A B22 sign allows cyclists and speed-pedelec riders to turn right on red or amber. A B23 sign allows them to continue straight, but they must give way to other road users.

Red traffic light with an exemption sign for cyclists
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Does opening a window make an alcohol-impaired driver safe?

514. Does opening a window make an alcohol-impaired driver safe?

✓ No, fresh air does not remove alcohol from the body.
Yes, but only when driving slowly.
Yes, if you feel more awake afterwards.
Yes, because fresh air helps you sober up.

Fresh air may make someone feel more awake, but it does not reduce their alcohol concentration or restore safe driving ability.

Open car window and an alcohol-impaired driver
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What limits apply when a motorcyclist filters between slow-moving traffic in Belgium?

515. What limits apply when a motorcyclist filters between slow-moving traffic in Belgium?

Exactly the same speed as the other traffic.
✓ No faster than 50 km/h and no more than 20 km/h faster than the other traffic.
Filtering is permitted only on the hard shoulder.
No faster than 70 km/h with no limit on the speed difference.

A filtering motorcyclist may not exceed 50 km/h and may travel no more than 20 km/h faster than the surrounding traffic. On motorways and express roads, filtering takes place between the two leftmost lanes.

Motorcyclist filtering between slow-moving vehicles
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Should the legal alcohol limit be treated as a safe target?

516. Should the legal alcohol limit be treated as a safe target?

✓ No, impairment can begin before the legal limit is reached.
Yes, because impairment begins only above the limit.
Yes, if you know exactly how much you have drunk.
Yes, when driving only a short distance.

A legal limit is an enforcement threshold, not a recommended drinking level. Even a small amount of alcohol can affect driving performance.

Alcohol consumption and the limits of safe driving
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should you check your mirrors before braking?

517. Why should you check your mirrors before braking?

To check whether the road surface is slippery.
✓ To know what is happening behind you.
To check whether your brake lights are working.
To shorten the distance needed to stop.

Checking your mirrors helps you understand what is happening behind you and anticipate how following traffic may react. In an emergency, do not delay necessary braking.

Driver checking following traffic before braking
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do before attempting to jump-start a vehicle?

518. What should you do before attempting to jump-start a vehicle?

✓ Check the owner's manual and make sure the connections are compatible.
Ignore battery damage if the terminals look clean.
Use any battery that physically fits the vehicle.
Connect the leads without checking their polarity.

Incorrect jump-starting can damage electrical systems, cause sparks, or make a battery explode. Connect the leads in the correct order before starting the vehicles, and follow the manufacturer's procedure exactly.

Preparing to jump-start a vehicle battery
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
You should check your mirrors before changing lanes.

519. You should check your mirrors before changing lanes.

False.
✓ True.

Checking your mirrors helps you see surrounding traffic before moving into another lane.

Driver checking a mirror before changing lanes
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do before making a turn?

520. What should you do before making a turn?

✓ Check mirrors, signal, and make sure it is safe.
Check only the traffic directly ahead.
Rely on other road users to slow down for you.
Turn as soon as the road ahead appears clear.

Before turning, check your mirrors, use your indicator, and make sure the turn can be made safely.

Driver preparing to turn at a junction
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should you avoid braking hard on a curve?

521. Why should you avoid braking hard on a curve?

✓ It can reduce control and increase the risk of skidding.
It can make the tyres grip the road more strongly.
It can make the steering feel heavier.
It can increase tyre pressure during the turn.

Hard braking on a curve can upset the vehicle's balance and reduce grip. Slow down before the curve and steer smoothly.

Vehicle braking while negotiating a bend
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What is the purpose of heated door mirrors?

522. What is the purpose of heated door mirrors?

To adjust the mirror angle.
To improve the headlights.
To fold the mirrors automatically.
✓ To clear mist or ice from the mirror glass.

Heated door mirrors warm the mirror glass to help clear mist, condensation, or light ice and improve rearward visibility. On some vehicles, they operate together with the rear-window demister.

Heated door-mirror control and demisting function
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do if your vehicle catches fire?

523. What should you do if your vehicle catches fire?

Open the bonnet fully to find where the fire started.
Stay inside the vehicle while waiting for assistance.
Try to move personal belongings out before leaving.
✓ Stop, switch off the engine, evacuate everyone, and call the emergency services.

Move everyone well away from the vehicle and call emergency services. If the fire is small and it is safe to do so, use a suitable fire extinguisher. Opening the bonnet fully can supply additional oxygen and cause the fire to intensify.

Vehicle with a fire breaking out
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do when an automatic vehicle is stationary in D?

524. What should you do when an automatic vehicle is stationary in D?

Select reverse gear.
Release the parking brake.
✓ Keep the brake pedal pressed.
Press the accelerator lightly.

An automatic vehicle may creep forward when D (Drive) is selected, even without pressing the accelerator. Keep the brake pedal pressed while stationary to prevent unintended movement.

Automatic gear selector in Drive and brake-pedal control
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should you be extra careful at night?

525. Why should you be extra careful at night?

✓ Visibility is reduced.
Street lighting makes drivers less alert.
Road surfaces are usually more slippery.
Road markings become less important.

At night, it is harder to see pedestrians, cyclists, road markings, and hazards. Reduce speed and use the correct lights.

Road traffic in reduced night-time visibility
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why is a microsleep especially dangerous while driving?

526. Why is a microsleep especially dangerous while driving?

It only affects your ability to hear.
✓ You can lose awareness of the road for several seconds.
It normally happens only when the vehicle is stopped.
It usually makes you drive more slowly.

A microsleep is a brief, involuntary episode of sleep that can last for a few seconds. During that time, you may lose awareness of the road and travel a considerable distance without reacting to hazards.

Driver losing alertness at the wheel
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should a motorcyclist avoid riding in another vehicle's blind spot?

527. Why should a motorcyclist avoid riding in another vehicle's blind spot?

✓ The driver may not be able to see the motorcycle.
The vehicle ahead must always change lanes.
The motorcycle will use more fuel.
The motorcycle's brakes may become less effective.

Motorcycles can be difficult to see, particularly when they remain in another vehicle's blind spot. Avoid staying alongside a vehicle where the driver may not see you, and choose a position where you are more likely to be visible.

Motorcycle in another vehicle's blind spot
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do if strong winds push your vehicle sideways?

528. What should you do if strong winds push your vehicle sideways?

Turn sharply against the direction of the wind.
✓ Keep calm and steer smoothly to maintain your lane.
Accelerate to make the vehicle more stable.
Brake hard immediately to stop the vehicle moving sideways.

Strong winds can push your vehicle off course, especially at higher speeds. Reduce speed and use smooth steering to stay in control.

Crosswind affecting a vehicle's road position
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
When may you normally use the horn in Belgium?

529. When may you normally use the horn in Belgium?

✓ To give a necessary warning to prevent an accident.
To express annoyance at another driver.
Whenever traffic is moving slowly.
To greet someone beside the road.

Horn signals must be as brief as possible and are permitted only as a necessary warning to prevent an accident. Outside built-up areas, they may also be used when necessary to warn a driver being overtaken.

Driver using the horn to warn other road users
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why is counting drinks an unreliable way to decide whether you can drive?

530. Why is counting drinks an unreliable way to decide whether you can drive?

You can judge your alcohol level by how sober you feel.
One drink affects every person in the same way.
Food makes each drink count as less alcohol.
✓ Drink strength, serving size, and individual effects can vary.

Alcohol concentration and serving sizes vary, and factors such as body size, food, medication, and time can affect impairment.

Alcoholic drinks with different strengths and serving sizes
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Which vehicle combination is covered by driving licence DE?

531. Which vehicle combination is covered by driving licence DE?

✓ A category D vehicle with a trailer over 750 kg.
A category B vehicle with a small trailer.
A category D1 vehicle without a trailer.
A category D vehicle with a trailer up to 750 kg.

Category DE covers combinations consisting of a category D towing vehicle and a trailer with a maximum authorised mass above 750 kg.

Bus and trailer covered by category DE
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

532. What does this vehicle-control symbol indicate?

Air recirculation.
Windscreen wiper speed.
✓ Windscreen washer.
Rear window demister.

This symbol indicates the windscreen washer. Operating the control sprays washer fluid onto the windscreen and normally activates the wipers to help clean the glass.

Windscreen-washer control and spray symbol
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do with a helmet that has taken a significant impact in a collision?

533. What should you do with a helmet that has taken a significant impact in a collision?

Keep using it if the visor or straps still work.
Keep using it if there are no visible cracks.
✓ Stop using it and follow the manufacturer's replacement guidance.
Replace only the outer shell if it is scratched.

A helmet can be damaged internally by a significant impact even when no damage is visible from the outside. Stop using the helmet and follow the manufacturer's guidance, which will commonly require replacement after a significant impact.

Helmet inspection after a significant impact
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What is the main purpose of a booster seat?

534. What is the main purpose of a booster seat?

To move the child closer to the front seats.
To replace the vehicle's seat belt completely.
To make the child high enough to see through the windscreen.
✓ To position the vehicle seat belt correctly on the child.

A booster seat raises and positions a child so the vehicle seat belt fits correctly. The lap belt should sit low across the hips and the shoulder belt should pass across the chest and shoulder, rather than the neck or abdomen.

Child seated in a booster with a vehicle seat belt
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Can you assume that you are safe to drive the morning after drinking?

535. Can you assume that you are safe to drive the morning after drinking?

Yes, if you eat breakfast before driving.
✓ No, alcohol may still remain in your body.
Yes, if you feel completely sober.
Yes, sleep removes all alcohol from your body.

The body needs time to process alcohol. Sleeping, eating, showering, or drinking coffee does not instantly remove it.

Fitness to drive the morning after drinking
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should cyclists avoid riding in a large vehicle's blind spot?

536. Why should cyclists avoid riding in a large vehicle's blind spot?

Large vehicles always have priority when turning.
✓ The driver may not be able to see them.
Blind spots matter only when a vehicle is reversing.
Cyclists must always stay behind large vehicles.

Buses and trucks have large areas where the driver cannot see cyclists, especially beside the vehicle and near turns.

Cyclist in a large vehicle's blind spot
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What is the purpose of the manual parking brake?

537. What is the purpose of the manual parking brake?

To select reverse gear.
To disengage the clutch.
To slow the vehicle during normal driving.
✓ To help keep the vehicle stationary when parked.

The manual parking brake helps keep the vehicle stationary when parked. It is normally applied by pulling up the handbrake lever and released before driving away.

Manual handbrake lever in a vehicle
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should you take regular breaks during a long journey?

538. Why should you take regular breaks during a long journey?

To reduce tyre pressure.
To make the journey feel shorter.
To improve fuel quality.
✓ To help prevent fatigue and maintain concentration.

Regular breaks during a long journey help reduce fatigue and maintain concentration. Do not wait until you are struggling to stay awake before stopping to rest.

Driver resting during a long journey
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What does this dashboard symbol indicate?

539. What does this dashboard symbol indicate?

✓ Low windscreen washer fluid.
Engine-temperature warning.
Low coolant level.
Windscreen demister active.

This symbol indicates that the windscreen washer fluid level is low. Refill the washer-fluid reservoir with suitable fluid when possible.

Low washer-fluid warning symbol on the dashboard
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do after hitting a deep pothole hard?

540. What should you do after hitting a deep pothole hard?

✓ Check for tyre or wheel damage when it is safe to stop.
Continue driving normally if the tyre still looks inflated.
Brake sharply to check whether the wheels are damaged.
Increase speed to see whether the steering remains stable.

A hard impact with a pothole can damage tyres, wheel rims, steering, suspension, or wheel alignment. When it is safe to stop, inspect the tyres and wheels and pay attention to unusual vibration, pulling, or steering changes. Have the vehicle checked if you suspect damage.

Checking a tyre and wheel after hitting a pothole
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What does this vehicle-control symbol indicate?

541. What does this vehicle-control symbol indicate?

Air conditioning.
Cabin temperature adjustment.
Air recirculation.
✓ Airflow direction.

This control selects the direction of the ventilation airflow, such as towards the face, feet or windscreen.

Control for directing cabin ventilation airflow
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why does higher speed increase the risk of aquaplaning?

542. Why does higher speed increase the risk of aquaplaning?

The vehicle becomes heavier as speed increases.
Higher speed increases the tyre pressure.
✓ The tyres have less time to clear water from the road surface.
The brakes cannot remove water from the tyres.

At higher speeds, the tyres may not disperse water effectively, making it easier for the vehicle to lose contact with the road.

Vehicle speed and aquaplaning on a wet road
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Which control is normally used to switch on the dipped headlights?

543. Which control is normally used to switch on the dipped headlights?

✓ The lighting control.
The hazard warning switch.
The windscreen-wiper control.
The rear-window demister.

The lighting control is normally used to switch on the dipped headlights. Depending on the vehicle, it may be a rotary switch or part of a lighting stalk.

Lighting control for switching on dipped headlights
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
When may drivers normally use the horn at night in Belgium?

544. When may drivers normally use the horn at night in Belgium?

✓ When necessary to avoid danger.
Whenever overtaking.
Whenever another vehicle is nearby.
Whenever approaching a junction.

At night in Belgium, use of the horn is generally restricted to situations where it is necessary to avoid danger.

Vehicle horn use during night-time driving
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should a designated driver do?

545. What should a designated driver do?

Stop drinking shortly before driving.
Drink only low-alcohol drinks.
✓ Remain alcohol-free for the entire journey.
Drink only a small amount with food.

A designated driver should remain sober so they can drive safely and respond properly to traffic conditions.

Alcohol-free designated driver for a journey
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do before rejoining traffic after a breakdown?

546. What should you do before rejoining traffic after a breakdown?

Signal and expect approaching traffic to slow down.
Enter the lane slowly so other traffic has time to react.
✓ Check all around, signal, and enter only when there is a safe gap.
Pull out as soon as there is enough space for your vehicle.

Check mirrors and blind spots, signal clearly, and build up speed safely without causing approaching traffic to brake suddenly.

Vehicle preparing to rejoin traffic after a breakdown
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
How should you approach a sharp bend on a mountain road?

547. How should you approach a sharp bend on a mountain road?

✓ Reduce speed before the bend and remain in your lane.
Accelerate through the bend to maintain momentum.
Move toward the centre of the road for a better view.
Overtake just before entering the bend.

Mountain bends may hide oncoming vehicles, cyclists, animals, or debris. Slow down before entering and keep a safe road position.

Sharp bend on a mountain road
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
What should you do if another driver does not give way when they should?

548. What should you do if another driver does not give way when they should?

✓ Slow down and avoid a collision.
Use the horn and continue at the same speed.
Maintain your speed because you have priority.
Accelerate so you pass through first.

Even if you have priority, safety comes first. Slow down, stay calm, and avoid creating a dangerous situation.

Conflicting vehicle movements at a junction
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Why should you avoid travelling with the seatback excessively reclined?

549. Why should you avoid travelling with the seatback excessively reclined?

✓ It can reduce how effectively the seat belt restrains you.
It can cause the seat belt to lock during normal driving.
It can cause the seat to slide forwards when braking.
It can prevent the head restraint from being adjusted.

An excessively reclined seat can affect how the seat belt fits and restrains your body and may increase the risk of sliding under the lap belt in a collision. Sit in a reasonably upright position so the lap belt stays low across the hips and the shoulder belt lies correctly across the chest.

Vehicle seat with an excessively reclined backrest
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA
Which control is normally used to switch between dipped and main beam headlights?

550. Which control is normally used to switch between dipped and main beam headlights?

The dashboard brightness control.
The windscreen-wiper stalk.
✓ The lighting stalk.
The hazard warning switch.

The lighting stalk is normally used to switch between dipped and main beam headlights. The exact movement varies between vehicles, so check the vehicle controls before driving.

Lighting stalk for switching between dipped and main beam
AI-generated by Rijbewijs-online.be • WCIT • CC BY-SA