Registration Of Third Transport Workers(Driver/Helper) Under CLRA

Dear Sir, Good Evening! We need your valuable suggestion as per below query; We are dealing in the production industry of cryogenic liquid & supplying the same to various customer from plant. We have engaged a vendor which provide us the service for the transportation(Include Vehicle, fuel filling & maintenance, drivers/helpers in vendor scope) of our industrial product from our plant to the various customer sites. in this process Drivers/helpers of the vehicle used to stay in the rest room at our plant premises till the time their vehicles get load with the product & then move the customer site. total strength of the same sometimes may exceed more day 20 Nos. in a day but not any point of time throughout the day. my queries are: 1. DO we (Principal Employer) need to register them under CLRA? or just have to ensure the same form the vendor side. 2. If we do not register them then under what basis/clause of CLRA we can justify for not to go for the registration. 3.What may the repulsion/future impacts/risk we have if not go the registration? 4. What are the liabilities we have a principal employer for these drivers/helpers. Thank you very much for your advice. Regards... Navneet Kumar