Main Street is posted 15. The park is posted 15. Arabella and Marit already know about the leash. That is as much traffic law as a fictional town needs on a first map.
The street is here so the other five pins have something to face. Butcher on one side of the story, bakery on the other, park at the end of it, desk wherever the lights are on. We are not drawing the rest of the blocks until these six have earned them.
If you are actually behind a wheel tonight, use the number on the sign in the town you are in. This one is paper.