I think truck driver casualties went up slightly in the UK after their introduction.
What a load of bollox, what next it is unsafe to drive a truck under 750hp just incase you need to acceperate out of a dangerous situation
Truck driver Gene Michaud was charged under the Highway Traffic Act with not having a working speed limiter and he challenged the requirement on commercial vehicles, saying the speed limit of 105 kilometres per hour puts him in danger.
“Inability to accelerate, or not accelerate fully places a driver in a less-than-safe situation because we have taken some of the tools required to drive properly away from the driver,” justice of the peace Brett Kelly found.
If he drove at 90 km/p/h like we do, then he would have 15 km/p/h to accelerate out of trouble with 
Statistics are not safe - the public will kill themselves living up to them. 
Winseer:
Statistics are not safe - the public will kill themselves living up to them.
92% of them are made up on the spot.
Not safe my arse. You know it’s there so you drive accordingly. Trying to overtake someone for 27 miles because your truck is 0.3 mph is unsafe not the fact there’s a speed limiter.
They are safe as others have said. The early non standard fit ones were a bit unnerving when the accelerator would pull away from your foot but you soon got use to it.
From what I read on here the auto boxes are the biggest problem at least a few years ago we still had to crunch our way through the gears to keep us awake!
CM
Speed limiters which are set at anything under 88-90kph are a bloody pain in the arse. Unfortunately these days it seems to be getting more and more common. Had a wagon the other day which was limited at 81. Horrible to drive on motorways, and borderline dangerous for the tailbacks they cause. All other LGVs will hog the 2nd lane overtaking pretty much in queues, and you are forced to plod along knowing that you are causing it all, but powerless. 
i had a lorry showing 55, but it was doing 65. it went in for service and test and came back at 52. it went straight back after 2 days of it. i refused to drive it. they set it up to 58. i was happy with that.
Ontario and Quebec are the only places anywhere in North America that require speed limiters and the only reason my truck has one set at 105 is that we regularly transit those provinces. It is somewhat annoying getting over taken by a Quebec or Ontario truck that quite obviously doesn’t have a limiter on when its his bloody province that requires mine to.