Many motorists "klaxon" to show support for demonstrations or striking workers but strictly it is illegal other than to avert danger. A couple caught in the Gilets jaunes blockage at Montauban were finally allowed through the barrage after being told to hoot for support. As they left they also made a "friendly" toot towards the gendarmes who were supervising the blockage.
It seems the policemen were not amused and eventually the couple received a fine of 22 euros for "abusive use" of a car horn.
The couple are outraged as they did not support the actions of the GJs and their gesture to the police was accompanied by a cheery wave. They intend to pay the fine in 1 centime coins.
The moral: be careful who you hoot at.