A B1 driving licence is a category that allows you to drive light four-wheeled quadricycles up to 400kg unladen or 550kg if the vehicle is designed to carry goods. It is also sometimes referred to as a category B1 entitlement on your driving licence. The permitted type of driving with a B1 licence is a medium-sized passenger car, which is defined as a medium-sized passenger car that does not exceed 6 meters, and the approved number of passengers includes 10 or more, and 19 people includes 19 or less.

It is important to note that the rules and categories on driving licences can vary depending on when you passed your test and the weight of the vehicle you intend to drive. If you passed your car driving test before 1997, you generally have a C1 entitlement on your licence, which allows you to drive a vehicle and trailer combination up to 8,250kg maximum authorised mass (MAM) . If you passed your test on or after 1 January 1997, you can drive a vehicle and trailer with a maximum weight of up to 3,500kg.

In summary, a B1 driving licence is a category that allows you to drive light four-wheeled quadricycles up to 400kg unladen or 550kg if the vehicle is designed to carry goods. It is important to check your driving licence categories to see what vehicles you are entitled to drive, as the rules and categories can vary depending on when you passed your test and the weight of the vehicle you intend to drive.