Average speed cameras A9

I’m doing store deliveries in Inverness this week. Sitting bang on 50 through average speed camera sections both north and south of Perth and getting passed by a lot of trucks. This got me thinking - can average speed cameras pick up hgvs above the speed limit for the category of vehicle?

When i was working up that way i used to sit on the limiter between dunblane and perth.When on the single parts of the A9 i used to sit at 85kph and i never heard anything.

No they dont they are only set at the speed limit for that road

Sent from my HTC One_M8 using Tapatalk

Thanks for replies. I figured that must be the case as virtually everyone seems flat out north of Perth