Which of the following actions is allowed while operating a motor-assisted scooter?

Crossing at intersections is allowed while operating a motor-assisted scooter because it is a crucial component of road navigation and safety. When riders approach an intersection, they must adhere to traffic signals and rules that are applicable to all vehicles, which includes yielding to pedestrians and ensuring that it is safe to cross. This action is considered a standard practice for any vehicle or mode of transport, including scooters, emphasizing safety and adherence to traffic laws.

The other options are restricted due to safety concerns or specific regulations. Riding on sidewalks can endanger pedestrians and may be prohibited in many areas. Parking in bike lanes can obstruct cyclists and is typically against the regulations intended to keep those lanes clear. Riding without safety equipment undermines personal safety and is often addressed by laws that require the use of helmets or other protective gear. Thus, crossing at intersections remains the only action that is appropriately permitted while operating a motor-assisted scooter under standard traffic regulations.