Effect of rubble and mines on local supply?

[Outlaw Josey Wales]

Penetrated minefields or rubble tells me they have a cleared path through. But, only one lane. They still have to watch out because there is always one dumbass that will test the limit or just not pay attention to his surroundings. When cleared, a minefield is completely removed. Rubble is the lane is wider, but, the rubble is still there, just pushed further to the side.