When should a passenger board a motorcycle?

A passenger should board a motorcycle after the rider has mounted and started the engine to ensure safety and stability. By waiting until the rider is already mounted, the motorcycle is in a more controlled position, reducing the risk of it tipping over as the passenger gets on. Additionally, starting the engine after mounting helps to ensure that the bike is ready to go, allowing the rider to be fully focused on balancing and controlling the motorcycle rather than trying to stabilize it while a passenger boards.

It's important to note that boarding before the rider mounts the motorcycle could lead to a loss of balance, while boarding on a flat surface enhances safety, it is not a strict necessity if the rider is capable of maintaining balance when the passenger gets on. Boarding while the bike is moving slowly is unsafe and could result in a fall or loss of control, making it essential for the passenger to wait until the motorcycle is stationary and stable after the rider has taken their position.