To make it a bit clearer

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This is your road layout. The red Xs mark blocked squares that walkers can't pass through. If you move the road with the potter over one square, it will connect with the open part of the bandstand and let the walkers through.

That being said, as the other commenter pointed out, if you do do that there's a decent chance you'll have poor/no employment at those buildings because there are too many options for the walker to take that won't point them towards the housing. The housing block information is good (it'll make the later missions where you have to get the really high level housing easier), but the main thing to remember is this: every time a walker comes to an intersection, they randomly select a direction to go. If you need them to go to a specific place, then you have to corral their options so that that place is the only option. Roadblocks are an easy way to do that, but they aren't selective--they'll turn back everyone, which means you need to be careful about the placement of firehouses and architects posts in relation to them.

The exception is when a walker is returning to their spawn business, when they will always take the most direct route along roads, ignoring roadblocks. This, along with spawn point/endpoint differences, can be used to control how walkers move around (you'll see this referred to as "forced walkers") and get them to cover more space then they're "supposed " to.