[WolfeMacleod]

Originally Posted by Heel n Toe

Wolfe, the zombie troupe could've been walking through the wooded area and came out onto the highway after the blockage occurred.

I watched about 15 minutes of this... Talking Dead – AMC ...and it was good for a few laughs and "what if's" and questions like yours. They took phone calls and emails.

COulda been,.

Here's the exact spot where the filming occured. They could have come from the road just down the hill... but I find it unlikely that a very dense troupe of dead folk would just be traipsing through to woods.
Google Maps