Where Factory Act is applicable Fork Lift Tractor driving not required any license. But peridic training is essential for drivers.
This is more better if drivers have the licence issued by Road & Trafic Officer. Trafic Rules is not applicable in the factory.
23rd May 2014 From India, Mumbai
You can refer Motor Vehicle Act, 1988,
Section 2 - Subsection (21) “light motor vehicle” means a transport vehicle or omnibus the gross vehicle weight of either of which or a motor car or tractor or road-roller the unladen weight of any of which, does not exceed  kilograms ;
I had attached soft copy of same.
18th July 2014 From India, Vapi