Support us

Traffic jamFrance

Learn traffic rules with clear explanations and visual examples in our illustrated book, designed to make studying simple and engaging.

Traffic signs
Traffic rules
France

86. Traffic jam

A traffic jam is a situation where traffic becomes heavily congested and vehicles move very slowly or stop for extended periods. Traffic jams are commonly caused by high traffic volumes, accidents, roadworks, lane closures or poor weather. Drivers should remain patient, keep a safe distance, avoid unnecessary lane changes and watch for motorcycles, emergency vehicles and sudden braking. Where lanes merge during congestion, local rules may require drivers to use a zipper-merging system.

Traffic jam
Temporary warning sign for traffic congestion. (Arthaz-Pont-Notre-Dame, Haute-Savoie, France)
Wikimedia.org • Marc Mongenet • CC BY-SA
What is a traffic jam?

A traffic jam occurs when traffic becomes congested and vehicles move slowly or remain stationary because the road cannot accommodate the normal flow of traffic.

What causes traffic jams?

Common causes include heavy traffic, accidents, roadworks, lane closures, bottlenecks and poor weather.

How should you drive in a traffic jam?

Keep a safe distance, avoid sudden braking and unnecessary lane changes, and remain alert for changing traffic conditions and emergency vehicles.

Should you change lanes frequently in a traffic jam?

Usually not. Frequent lane changes can disrupt traffic flow and increase the risk of collisions. Change lanes only when necessary and safe.

What is zipper merging?

Zipper merging is a system where drivers use all available lanes until a lane ends or becomes blocked and then merge alternately into the remaining lane.

Should you leave space for emergency vehicles in a traffic jam?

Yes. Many countries require or recommend drivers to create space for emergency vehicles when traffic becomes congested or stationary.

1 France 2 Motorway 3 Expressway 4 Residential area 5 Zone 6 Speed limit 7 Minimum speed 8 Advisory speed 9 Footpath 10 Bike path 11 Pedestrian warning 12 Tunnel 13 Bridge 14 Cycling street 15 Pedestrian zone 16 Speed bump 17 Toll road 18 Customs 19 One-way traffic 20 Quay 21 Slope 22 Bus lane 23 Bus stop 24 Dead end 25 Stop sign 26 Give way 27 Roundabout 28 Priority road 29 Road narrowing 30 Priority over oncoming traffic 31 Give way to oncoming traffic 32 Pedestrian crossing 33 Railway crossing 34 Mandatory direction 35 Turn prohibition 36 School area 37 Overtaking 38 Crossing animals 39 Slippery road 40 Rockfall 41 Aircraft 42 Curve 43 Chevron 44 Wrong-way driving 45 Roadworks 46 Crosswind 47 Height limit 48 Width limit 49 Length limit 50 Weight limit 51 Radar speed sign 52 Selective barriers 53 Low-emission zone 54 Priority at the next junction 55 Traffic lights 56 Traffic lights warning 57 Pedestrian lights 58 Road markings 59 Junction layout 60 Bike box 61 Speed feedback 62 Driving licence 63 Location marker 64 Road number 65 Countdown markers 66 Public toilet 67 Rest area 68 Traffic mirror 69 Emergency telephone 70 International border 71 Cycling route 72 End of restriction 73 Parking 74 No parking 75 No stopping 76 Parallel parking 77 Alternate-side parking 78 Parking meter 79 Parking disc 80 Disabled parking 81 Traffic management 82 Merging 83 Reversing 84 U-turn 85 Carpool 86 Traffic jam 87 Uncontrolled crossroad 88 Road surface 89 Ring road 90 Exit 91 Information point 92 Horse riding 93 Provisional licence 94 Hazardous cargo 95 Emergency exit 96 Runaway truck ramp 97 Radio service 98 Oversize load 99 Lane 100 Tyre inflation station ...