What is the meaning of Roadster?

A horse for riding or driving on the road.

A bicycle, or tricycle, adapted for common roads, rather than for the racing track, usually of classic style and steel-framed construction.

One who drives much; a coach driver.

A hunter who keeps to the roads instead of following the hounds across country.

An open automobile having a front seat and a rumble seat.

A person who lives along the road. (Can we add an example for this sense?)

a sea-going vessel riding at anchor in a road or bay.

A clumsy vessel that works its way from one anchorage to another by means of the tides.

roadster (automobile)

roadster

roadster (vehicle)

Source: wiktionary.org