Tourists who have hired cars are avoiding speeding fines on busy north and north-east roads while motorists who use the routes regularly are being targeted "like fish in a barrel".
Average speed cameras between Dundee and Stonehaven earned nearly £1 million in fines last year.
Speed limits for lorries could be increased on roads across Scotland after a trial on sections of the A9 between Inverness and Perth.
Two sets of cameras enforcing reduced 50mph speed limits on the busy A90 dual carriagway will be switched off next week.
Crashes and deaths on the A9 have dropped significantly in the three years since controversial speed cameras were introduced on the notorious stretch of road.
Controversial average speed cameras have dramatically cut speeding rates on the north-east’s busiest road, according to a new study.
The average speed cameras on the A90 Aberdeen to Dundee road are expected to go live today.
The average speed cameras on the A90 Aberdeen to Dundee road will go live from October 31.
Transport chiefs have ruled out installing average-speed cameras along the AWPR, despite claiming they are the best way to cut deaths on the neighbouring road.
Controversial average speed cameras are to be introduced along a 50-mile stretch of the A90.
Average speed cameras were controversially introduced on the A9 Inverness to Perth road in 2014.
Motorists will face more delays on the way in and out of Aberdeen from next week as the average speed cameras are extended - to Stonehaven.
Average speed cameras will go live on one of the north-east's busiest commuter routes next week.
Work has started to install more average speed cameras on the north-east's busiest road.
Nearly 500 drivers have been clocked by controversial average speed cameras on the north-east's busiest road.
The number of accidents and deaths on the A9 has continued to drop since the introduction of average speed cameras along the route 18 months ago.
Average speed cameras have come into operation on the north-east's busiest road - more than three months after they first appeared.
Average speed cameras installed to protect workers upgrading the north-east's busiest road could finally be switched on next week.
Speed cameras on one of the north-east's busiest roads are still switched off after nearly three months.
Average speed cameras along a stretch of one of the north-east's busiest roads are not operational - despite a series of new signs along the route.
Stephen Walsh
Average speed cameras could be installed on a notorious north-east road as part of multi-million pound plans to improve safety.
Controversial average speed cameras have failed to lower the number of deadly accidents on the A9 between Perth and Inverness.
Derek Mackay has insisted he feels "vindicated" by the latest data on fatal A9 accidents.
Drivers are facing more misery on the north’s most notorious road as new speed curbs are introduced as part of the £3billion dualling project.
It almost a year since the controversial average speed cameras along the A9 were installed and switched on for the first time.
Temporary average speed cameras are to be switched on at the A90 northbound at the Forth Road Bridge.
The SNP have been accused of desperately trying to “shut down debate” over fears average speed cameras could be instaled on two major north-east roads.
Former First Minister Alex Salmond has claimed a rival MSP was “talking through a hole in her hat” about the potential installation of average speed cameras on two major north-east roads.
The Scottish Government has admitted it was keeping its “options open” in respect of instaling average speed cameras on two major north-east roads.
A group of SNP politicians have clashed with Highland MP Danny Alexander over his opposition to average speed cameras on the A9.
Transport Minister Derek Mackay has said he was "very encouraged" by the impact of average speed cameras on the A9 but admitted accident rate figures would not be available until later this year.