What must be included in the written record for each driver hired?

The correct answer is the requirement that on-road test results in traffic be included in the written record for each driver hired. This is vital because it ensures that the driver has successfully demonstrated their ability to operate a vehicle safely in real-world conditions. This assessment provides concrete evidence of the driver's skill level and their understanding of safe driving practices, which are crucial for maintaining road safety and compliance with regulations.

Including on-road test results demonstrates that the driver has not only theoretical knowledge of road rules but also practical experience in navigating traffic, responding to road conditions, and handling potential hazards. It is an important part of the hiring process to verify that drivers meet the safety standards required for operating vehicles in a professional context.