Motor Vehicles Act, 1988
6. Restrictions on the holding of driving licences.
No person shall, while he holds any driving licence for the time being in force, hold any other driving licence except a learner's licence or a driving licence issued in accordance with the provisions of section 18 or a document authorising, in accordance with the rules made under section 139 the person specified therein to drive a motor vehicle.
No holder of a driving licence or a learner's licence shall permit it to be used by any other person.
Nothing in this section shall prevent a licensing authority having the jurisdiction referred to in sub-section (1) of section 9 from adding to the classes of vehicles which the driving licence authorises the holder to drive.