HGV Speed limits

[tvrgit]

A wee question for the BiB:

NSL on a single carriageway road, for an HGV over 7.5 tonnes, is 40 mph, and for cars, 60 mph.

If the roads authority introduces a speed limit that lowers the NSL from 60 to 50, so NSL regs no longer apply, what is the new speed limit for lorries? Is it then the plated limit of 50, or is it still 40?

In other words, could reducing the speed limit result in lorries being allowed to go faster?

[tvrgit]

Right, thanks guys, so in other words the national speed limit for that class of vehicle still applies, even if i higher speed limit for all traffic is posted.

Makes sense, but thanks for confirming.