And I have had AI tanks and armoured cars, halftracks etc happily trundle through BW, some getting stuck in the process.
It comes down to what it thinks is worthwhile in route-planning, so if there is a really wide wire entanglement it will often decide to go through rather than round. If there appears a gap (assuming it knows of no mines in that gaphex !
within maybe 6-10 hexes then it will often take the detour, as it thinks wire is a potential breakdown hex (which it is, like marsh and streams).
Tanks are a good way to flatten wire, until you get one tangled up with wire in the sprockets.
Cheers
Andy