Final answer:
When parked on the road, a motorcycle should be positioned parallel to the curb to ensure traffic flow is not obstructed and the risk of collision is minimized. The answer is option D.
Step-by-step explanation:
In general, when parked on the road, a motorcycle should be parked parallel to the curb. This ensures that the motorcycle is not obstructing the traffic flow and is safely positioned within the parking space designated along the roadside. When a motorcycle is parked correctly, it also minimizes the risk of being hit by passing vehicles.
Considering the dynamics of motorcycle stability, when a motorcycle accelerates, both linear and angular acceleration are experienced by its wheels. For a bicyclist, maintaining stability during a turn requires leaning into the turn to a precise angle so that the force exerted by the ground is aligned with the center of gravity. This involves a combination of frictional and normal forces acting on the bicycle wheel, as described previously.