[poppyseed]

Of course, beyond the traffic problems around here (and they're legion), there's also the possibility that the killer wasn't rushing out of the parking lot. He could have been in a different parking lot, or possibly he opted to meander from the scene figuring that authorities would be looking for someone leaving in a hurry.

[Route66]

"He could have been in a different parking lot, or possibly he opted to meander from the scene figuring
that authorities would be looking for someone leaving in a hurry."

Or he could be parking or being dropped off away from the site and walking in and back out. Or even using a bike or motorcyle.