Mmm. Yeah, OK, I'll endorse it, with reservations.
It's not without risks, but worth a try. If you appear on the road, the zombies most likely will go after you, at least initially. This should buy Greg and Travis just enough time to get to the truck. But if it doesn't work, then don't blame me: zombies are highly unpredictable.
You may proceed to Part IV of the case.