Final answer:
Properly parked vehicles must have their wheels within 18 inches of the curb when parallel parked to ensure smooth traffic flow and street orderliness.
Step-by-step explanation:
When properly parked parallel to a curb, the wheels on one side of your vehicle that is alongside the curb must be within 18 inches of the curb. This requirement ensures that vehicles are parked close enough to the curb to allow for the free flow of traffic and to maintain an orderly appearance on the streets. To properly execute parallel parking, you need to signal your intention, pull up parallel to the car in front of the space, reverse slowly into the space, and adjust the steering to bring the vehicle into the proper position within 18 inches of the curb.