MPI Professional Driver's License Manual Practice Test 2026 - Free Professional Driver's License Practice Questions and Study Guide

The maximum length permitted for a drawbar or coupling device between vehicles, except for a pole trailer, is specified as 5 meters. This regulation is in place to ensure that the connection between vehicles is safe and manageable, allowing for proper handling and maneuvering, especially during turns or when braking. A drawbar or coupling device that exceeds this length can lead to stability issues, making it more difficult for the driver to control the vehicles as a unit, which could increase the risk of accidents.

Regulatory limits on coupling lengths take into account factors such as turning radius, stability, and the overall safety of operations on the road. Maintaining a maximum length helps align with safe operational standards to protect not just the driver but also other road users. The specific measurement of 5 meters balances the need for flexibility in vehicle arrangements while ensuring safety is not compromised.