Canny Driving on Motorways

When we drive on Motorways we typically see a variety of strange situations, for example:• One lane suddenly comes to a stop whilst the other lanes continue• All lanes come to a stop, then restart, only to all stop again a few hundred yards down the road• Yet after another short distance we sometimes accelerate away without seeing any reason for the hold-up• 'Rubbernecking' by drivers causes a car...