When is it legal to ride double on a motorcycle?

Riding double on a motorcycle is legal when the motorcycle is designed for two passengers. Motorcycles that are built to accommodate a second passenger usually have the necessary seating, footpegs, and safety features to ensure that both the rider and the passenger can travel safely. This design consideration is crucial because it takes into account balance, weight distribution, and overall stability, which are essential for safe operation.

Having a valid motorcycle endorsement is an important requirement for the rider, but it does not concern the legality of riding double. Similarly, while helmet use is critical for safety and often required by law, it is not a determining factor in the legality of having a passenger. The presence of a sidecar also changes the dynamics of transport and does not directly relate to the motorcycle's ability to carry two passengers in the standard seating arrangement. Hence, the key factor rests on the motorcycle's intended design for accommodating two riders.