Vehicles can drive beside each other continuously,
a) only if they drive through a one-way road with two driving lanes in a municipality,
b) only if they drive on a highway and on a speedway,
c) if traffic on a road with two or more driving lanes in one driving direction is so heavy
that the continuous lanes of vehicles are created, in which a driver of the motor vehicle can
drive only at such speed that depends on the speed of vehicles driving in front of him.
