The so-called Act 6 of the actions by the protestors is to block the frontiers at all the major points of entry/exit. In this region this is intended to be at the A9 peage station at Boulou on the autoroute to Spain. Only freight lorries are to be stopped carrying imports or exports, cars should not be held up.
The web site used by many of the protestors says it will inflict a serious blow to the economy. Lorry drivers who can "prove" that they are returning home will be allowed to pass.
At least the border police will be able to concentrate on keeping migrants out if the citizens are assuming control of the freight movement!