Love this movie but mann could've easily escaped.
It's been discussed here before but when he hides in the bushes while the truck drives by mann could've easily turned around the other way. We don't know how much time has passed but if it was an hour or so there's no way the truck would've caught up to him.
My only theory is the driver knew he was hiding there and wanted to toy with him more thinking he didn't know his plan. Even if that's the case he still waited for him to approach he would have no way of knowing if Mann would step up his intelligence and just turn around. Unless he somehow had a view of mann's car from the spot the trucker stopped but I highly doubt it.