A slow tractor can test a driver’s patience, but overtaking a tractor on a solid line in France is generally prohibited.
The tractor’s low speed does not by itself create permission to cross or straddle a continuous center line.
Under the French Highway Code, drivers must respect continuous road markings. Crossing into the opposite lane to pass a moving agricultural vehicle is not normally allowed when a solid white line separates traffic.
A tractor is slow, but it is still a moving motor vehicle. The limited exceptions that can apply to certain vulnerable road users should not be treated as permission to pass a tractor.
When a solid line is paired with a broken line, drivers follow the marking closest to their lane. Overtaking may be considered only if the broken line is on the driver’s side and every normal safety condition is satisfied.
An unlawful maneuver across a solid line can lead to enforcement action, including a fine and driving-license points. The precise consequence depends on the maneuver and the current legal provisions.
Do not treat a slow tractor as an exception to a solid line. Wait for a clearly legal passing area and follow signs or police directions. This general information should be checked against the current French Highway Code before publication.