$SPEED

A general multiplier that determines the speed at which the vehicles move across the screen.

Each unit (vehicle) has an individual speed value attached to it.  This can be specified by the modification command [#V: ] in the vehicle's Stock List entry or by the V= parameter in the Movement command of the particular line.  If neither of these is specified, a random value will be chosen.

The $SPEED command changes the speed of the movements of all vehicles equally - it acts as a multiplier for all vehicles' speeds. The relative speed of the vehicles to each other is not modified by this parameter.  The command also does not affect the wait times.