"Vehicle Only"

[Jeff Conner]

When you have terrain with high protection values and you need to take the hex, you should use HEAT rounds or flame weapons and get close enough to assault. If you don't need to take the hex, bypass it and continue to advance.

I do believe that when it says "no effect" it means no effect. The manual is not real clear on some of these things though so I could be wrong. You can always set up a test scenario and try it 100 times and see if you get a result. That sounds like it would take a while, but once you get the hang of it, your test would probably only take a half hour or so.