Since August 2, 2021, inter-lane traffic (CIF) has been authorized on an experimental basis for powered two-wheelers and three-wheelers on highways and expressways, when traffic is heavy. This experiment was supposed to end on the 1^er August 2024 and be reviewed.

The scheme was extended for the first time until 15 September 2024.

A new order of September 11, 2024, extends it again until December 31.

The principles of inter-line traffic

This experiment conducted for 3 years concerns 21 departments of which: Bouches-du-Rhône, Haute-Garonne, Gironde, Hérault, Isère, Loire-Atlantique, Nord, Rhône (including the Lyon metropolis), Var, Alpes-Maritimes, Drôme, Vaucluse, Pyrénées-Orientales as well as the 8 departments of the Île-de-France region.

In the test areas the following conditions shall be met:

• the practice is permitted on motorways and roads with two carriageways separated by a median and with at least two lanes each, where the maximum permitted speed is greater than or equal to 70 km/h;
• traffic between queues of vehicles which are stationary or traveling at a very reduced speed is carried out on the two tracks, having the same direction of traffic, furthest to the left of a road;
• the lateral space between vehicles traveling on the two most left-hand lanes of a carriageway must be sufficient;
• inter-lane traffic shall be carried out at a speed of not more than 50 km/h, with a differential of 30 km/h compared to other vehicles;
• none of the traffic lanes on the roadway are under construction or covered in snow or ice;
• before traveling in inter-lanes, the driver shall inform other users of his intention;
• two or three-wheeled power-driven vehicles must not force the passage;
• prohibition of a vehicle in inter-lanes passing over another vehicle in inter-lanes;
• when traffic becomes more fluid and the vehicles travel at more than 50 km/h on at least one of the 2 lanes, the two or three-wheeled motorized vehicles must resume their place in the lanes.

Failure to comply with these conditions shall be subject to 3-point indentation on the driving license and a flat-rate fine of €135.