Convoy(1978)

A group of truckers are being harassed by a blackmailing policeman named Lyle Wallace. Using their CB radios, the truckers organize a convoy, to be led by "Rubber Duck," who has been pushed beyond what he can stand. After Rubber Duck refuses to submit to a fake speed trap that Wallace sets up, the policeman desperately chases him across several states. And as the convoy is publicized over the radio it attracts allies from all over, becoming a huge, illegal protest that makes the national news.