A vehicle's ability to traverse a specified terrain.(noun)
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Use "trafficability" in a sentence
"I've been an advocate of lifting the curfew for some time, and many of you probably know that it's been a matter of priority for the city council of the city of Baghdad as well as the district councils of Karkh and Karadah on either side of the river to get that bridge back open because of the trafficability (ph) challenges in Baghdad."
"A primary goal of engineer reconnaissance at the operational level is to provide comprehensive information on the trafficability of march routes."
"Reconnaissance determines the condition and trafficability of movement routes and the trafficability of off-road terrain, including bridge conditions and detour routes."