roadable
/ˈrəʊdəbl/originally and chiefly US
adjective
1Of a vehicle, etc.: suitable for using on a road, especially a public road; suitable for touring or travelling by road; roadworthy.
2Designating any of various (chiefly experimental) light aircraft that may also be driven on the road in the manner of a car.
Origin
Early 20th century. From road + -able. Compare slightly earlier roadability.