According to Alberta Hours of Service legislation, under which of the following conditions would a driver not be allowed to drive?

Under Alberta's Hours of Service legislation, a driver is regulated to ensure safety and avoid fatigue by limiting the number of hours spent on-duty. Specifically, drivers are not allowed to operate a commercial vehicle if they have already been on-duty for 15 hours, as continuing to drive beyond this limit increases the risk of fatigue-related incidents. This regulation is in place to protect not only the drivers but also other road users by ensuring that those operating commercial vehicles are alert and capable of driving safely.

In this context, the other conditions presented, such as vehicle weight, the presence of a safety plan, and poor weather conditions, do not directly relate to the driving hours and fatigue management that the legislation focuses on. While those conditions certainly affect safety and compliance in their own right, they do not fall under the specific restrictions concerning on-duty hours established by the Hours of Service legislation. This highlights the unique importance of monitoring on-duty hours within the framework of commercial driving regulations.