Like a lot of small firms, we run a small fleet of vans. 5 'Transit' sized Vauxhall Vivaro, and 1 'car' sized Peugeot Partner.
Now, I am a bit geeky with vehicles (my office calendar is vintage commercial vehicles), but even I was a bit caught out by this.
One of our drivers was 'caught' travelling at just over 70 on a dual carriageway, when the speed limit for vans is 60. (I knew this one)
This got me looking at the appropriate pages on .Gov - I didn't realise that similar vans have a limit of only 50 on an A road.
I assumed the Peugeot Partner was what is known as a 'car derived van' and hence the normal car speed limits applied. Not as simple as I thought. There are three different versions of this van. All look the same from the outside (ie square box rear body), but have different payloads.
If the total weight when laden is over 2000kg then the van speed limits apply, under that and car limits apply.
I needed to consult the registration document to discover ours has the heavier payload, and hence van speed limits.