Under what condition can a passenger be allowed to ride on a machine with the operator?

A passenger can be allowed to ride on a machine with the operator under the condition that a special seat and seatbelt have been provided. This requirement is crucial for ensuring the safety of both the operator and the passenger. Heavy machinery, such as excavators, is designed primarily for operational use, and without proper safety equipment, the risk of injury during operation significantly increases.

The provision of a special seat helps prevent the passenger from being thrown from the machine or otherwise harmed while it is in operation. The accompanying seatbelt provides an additional layer of protection, securing the passenger in place during movement and minimizing the likelihood of accidents arising from sudden stops or changes in direction.

Let's consider the other conditions. While having a trained operator may imply that safety practices are understood, it doesn't address the specific needs for passenger safety on the machine. Similarly, the length of the ride does not inherently ensure safety; a short journe y could still lead to accidents if proper seating arrangements are not in place. Lastly, wearing a helmet is often essential for protection in construction environments, but it cannot substitute for the critical safety measures of proper seating and restraint, which are designed specifically for the operation of the machine.