Traffic jams on the freeway occur for no reason, its just the logic of waves, one person breaks for a short duration and sets off a chain reaction, by the time the wave reaches the back, all of the small break Periods have combined to give the cars in the back a longer average break period. So put censors (standard) on front and back of cars that decrease speed, so that the two car "trail space" is never breached, this will also eliminate "rear-ending", an other problem that seeds traffic jams.