It has never been clear where the entrances in to and out of buildings are from roads. Some are obvious when there is only a single road segment:
Others are multi-square builds along side a multi-square road (e.g. the gas station). Some like the army surplus store has an obvious door way:
But others are less obvious, like the hardware store with fenced parking lots, the toy store with non-obvious doorways, etc. Which road segments can the building be entered from? I could not find details on this in the rules or the Zombies FAQ.
I feel like the density of the bright white border lines contains a clue, but nothing seemed to make sense there either. For example, the starting tile (above) has bright lines between the road segments.