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.
Definition of roadability in US English:
roadability
nounˌrəʊdəˈbɪlɪti
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.