Sharrows (also known as “shared lane markings”) are on-street pavement markings that are intended to remind people in cars to expect people on bikes on a street. They help to indicate bike routes, and they are useful to help people on bikes position themselves in the road.
Commercial Street, the main drag through town, is one-way for cars and two-way for bikes. It’s very narrow (about 22 feet, and narrower in places), has a narrow sidewalk of about 36″ on one side, with a parking lane next to the sidewalk for most of the street. The speed limit is typically signed 15 MPH.