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What is a B1 Driving License? You must pass a knowledge test as well as a skills test before you can apply for an endorsement to your license. You may also be required to pay fees and undergo a health test. A b1 license allows you drive vehicles with a maximum mass of 3,500kg and not more than eight passengers in addition to the driver. You can also drive a trailer under this category. It is a restraining version of the B category. The B1 license is a restricted licence and allows you to drive vehicles up to 40