Servi-Cars were three-wheeled motorcycles built by Harley-Davidson from 1931 to 1975. They had flathead 750cc engines, and were intended as utility vehicles for businesses and government agencies. The initial vision for these three-wheelers was that garages could tow them behind customers’ cars when delivering them. They then could unhook them from the cars and ride them back to the garage. In Arlington, Mass., where I grew up, the local police department had one, which they used for parking enforcement duties. The one in this picture was part of a display at Wheels Through Time, a motorcycle museum in North Carolina.