5 MPH is absolutely reasonable, the number of people are killed in collisions, well. Stick to your guns, enforce

It really depends on the environment and the size of the site, some of the sites I visit are 3 to 4 miles long. Note: a lot of speedometers in private vehicles will not register 5mph. Bigmac is right, whatever the speed limit is, make sure its enforced.

How would you monitor/enforce a 5mph limit? Or any limit come to that, but as most speedos don't register below 10 mph . . . how can drivers know what 5mph is?

5mph!!!!! Unless you have speed limits that are realistic and achievable then you're going to have problems. Not ALL vehicles register 5mph so how do you expect drivers to comply?

Hire a speed gun and set it up along with signs to remind site users of the speed limit. The usual response I got was "ooh I didn't realise I was going so fast! I’ll be more careful in future”. The worst offender wasn’t a boy racer but a sweet lady that worked in the library. Repeat the process but you don’t always need a real speed gun-anything that looks like it might be one has a calming effect on drivers!

5mph is a very low max speed, not really feasible for some vehicles. At just above stalling speed some engine/gear ratios will just not go that slowly. Whilst there is frequently a 5mph average speed achieved on sections of the M60 it is due to a combination of 25mph and 0mph! As others have said, better to set a realistic site limit that can be achieved and would be adhered to, with a combination of education and instruction backed up by some form of warning and ultimately sanctions if necessary for repeat offenders.

10mph for vehicles (cars, lorries, vans etc) found anything under this wasn't realistic. 5mph for all FLT's / PPT's - These are restricted by the manufacturer so they can not exceed this

You cannot drive a large goods vehicle at 5mph without feathering the clutch - and that's not safe or good for the vehicle. 15mph is realistic.

Thanks to everyone for the responses some really useful advice and ideas there. My feelings when I started was that 5mph was almost impossible to adhere to and that seems to be the case for most drivers. We are getting quite a few grumbles and our neighbours who use the same roadway in struggle to keep it under 45mph let alone 5mph! Would any of you have and recommendations for suppliers of the radar signs which display your speed? Thanks again

Assuming you have total segregation on site, with no pedestrian workers and physical barriers between trucks and people? 15-20 MPH, registers on a speedo, 5 mph doesn't. 20 MPH is a safe driving speed. Speed bumps are simply a pain in the spine, legs and wrists, they also damage the wheel alignments on truck wheels and cars - no matter what speed you drive over them. They are a menace to vehicle control. 20 MPH is what is considered a safe speed driving past schools. The actual point where trucks queue up to turn around and dump the waste is obviously going to be less than 5 MPH, leave that to the drivers professional competence. I would suggest on long stretches of road leading up and leading awat from the waste transfer station, you install tic-tak signs, that smile to register 20 MPH speeds and frown at other speeds. Nothing defeats safety more than over zealous controls by tin pot safety gods - the drivers are all professionals who do the job every day, don't make the job any harder than it has to be. (I have experience of actually doing this job of delivering to a waste transfer station, perhaps you could talk to the other drivers if you don't want to take my advice?).