A runabout is a car body style popular in the 1910s, based on the horse-drawn runabout carriage. It was popular in North America from 1900 to about 1915. It was a light, basic style with no windshield, top, or doors and a single row of seats. Runabouts eventually became indistinguishable from roadsters and the term fell out of use in the United States. The approach has evolved into the modern "city car".