When parking parallel, what is the optimal distance to leave curb side wheels from the curb?

The optimal distance to leave curbside wheels from the curb when parking parallel is typically between 6 to 18 inches. This distance is recommended because it allows sufficient space for pedestrians to walk past the vehicle without being forced onto the road, while also ensuring that the vehicle is close enough to the curb to minimize the risk of being struck by passing traffic. Staying within this range helps maintain safety and accessibility in urban areas and is also often in line with local parking regulations that aim to improve traffic flow and pedestrian safety. Such spacing can vary by jurisdiction, but this range is widely accepted as a best practice.