As nouns the difference between passability and trafficability
is that passability is the state or quality of being passable while trafficability is a vehicle's ability to traverse a specified terrain.
passability
English
Noun
(-)
The state or quality of being passable.
Antonyms
* impassability
trafficability
English
Noun
(-)
A vehicle's ability to traverse a specified terrain.
Related terms
* trafficable