Definition of roadability in US English:

roadability

noun

US
  • The ability of a vehicle to remain stable and hold the road whilst being driven; roadholding; (also occasionally) suitability for being driven on the road.

Origin

Early 20th century; earliest use found in The Syracuse Herald. From road + -ability.

Pronunciation

roadability

/ˌrəʊdəˈbɪlɪti/