Kavennus on keskitetty tiettyyn kohtaan ajorataa, joka pakottaa hidastamaan vauhtia. Kavennus voidaan tehdä keskisaarekkeella tai ajoradan reunoilta sivuesteillä.
Road narrowing is located to a certain point of road. It forces vehicles to reduce their speeds. Road narrowing can be implemented in two different ways: either by central island or by obstacles that are located on both sides of road.
