There was a similar question asked recently (by yourself?) my search function is not working at all.. Instead of providing you the relevant guidance I'd say that most H&S consultancies (definitely the major ones) will have people that can deal with this project (heck I'd happily offer my services if I wasn't employed and overworked...) as I did this with my last employer for their 8 warehouse sites (I do believe this is something you can work through in house with your operational guys but hey ho). A quick google search will provide lots of companies or get a recommendation from someone you know or a peer in the industry. Workplace transport is quite a "standard" topic for health and safety bods to have experience in, so it shouldn't be too difficult to find someone appropriate to help.