Licence Category and Towing Limits for a Trailer Combination
A driver holds a category B licence issued in Azerbaijan. They own a passenger car with a kerb weight of 1,450 kg and a maximum permissible mass of 1,950 kg. They want to tow a braked trailer with a maximum permissible mass of 1,300 kg. The car's manufacturer specifies a maximum towing mass of 1,500 kg for braked trailers. The driver also occasionally wants to tow a second, heavier trailer of 2,000 kg maximum permissible mass. The driver passed category B in 2019 and has no other categories.
1. Is the driver permitted to tow the 1,300 kg trailer on a category B licence? Show the reasoning against the relevant limits.
Read the worked answer
Yes. Category B in Azerbaijan generally permits a passenger car towing a trailer whose maximum permissible mass does not exceed 750 kg, or a heavier trailer provided the combined maximum permissible mass of the combination does not exceed 3,500 kg and the trailer's maximum permissible mass does not exceed the car's kerb weight (unladen mass).
Check each limit:
- Trailer MPM 1,300 kg ≤ car kerb weight 1,450 kg ✔
- Combined MPM: 1,950 + 1,300 = 3,250 kg ≤ 3,500 kg ✔
- Manufacturer's towing limit 1,500 kg ≥ 1,300 kg ✔
All conditions are met, so category B suffices. Note the driver must also respect the manufacturer's limit, which is stricter than the legal ceiling in this case.
2. What about the 2,000 kg trailer? What would the driver need, and what other checks apply?
Read the worked answer
The 2,000 kg trailer fails the category B conditions: it exceeds the car's kerb weight (1,450 kg) and would push the combination to 3,950 kg, above 3,500 kg. The driver would need to upgrade to category BE (or the appropriate trailer category), which requires the relevant test/eligibility.
Additional checks that still apply even with the right category:
- The manufacturer's maximum towing mass (1,500 kg) is exceeded by 2,000 kg - the combination would be unlawful and unsafe regardless of licence category.
- The tow bar, coupling, and trailer brakes must be rated for the load; the trailer needs working brakes and lights.
- The driver must ensure the trailer's MPM and the car's towing capacity are documented, and that the car's gross train mass is not exceeded.