Illustration from Oregon Bicycle and Pedestrian Plan, Oregon DOT close window

Diagonal parking takes up an inordinate amount of roadway width relative to the number of parking spaces provided. It can also be hazardous, as drivers backing out cannot see oncoming traffic. Changing to parallel parking reduces availability by less than one-half. Special note: on one-way streets, changing to parallel parking on one side only is sufficient; this reduces parking by less than one-fourth.