Average speed cameras between Dundee and Stonehaven earned nearly £1 million in fines last year.
Figures released by Police Scotland reveal that 9,630 people were caught speeding on the road, an average of more than 26 people per day, during the network’s first year of operation.
Each driver faces a fine of £100 and three penalty points on their licence, meaning the income from penalties issued last year totals £963,000.
However, authorities point out the number of people speeding has dramatically fallen in the same period, making the route safer.
The average speed cameras cover the entire 50 mile stretch of road between Dundee and Stonehaven.
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The £2 million system, which replaced 40 fixed speed cameras and mobile patrols, went live in November 2017.
It was ordered by ministers after three fatal collisions and six serious injury accidents on the dual carriageway in 2015.
There are 15 cameras installed on both sides of the carriageway measuring the speed of vehicles.
A Transport Scotland spokesman said the number of drivers exceeding the speed limit on the road has fallen to just 1% – down from around 60% before the average speed camera system was introduced.
He said: “Road safety is of paramount importance, which is why we are committed to achieving safer road travel, reducing the number of serious injuries and working towards an ultimate vision of zero fatalities on our roads.
“Before average speed cameras were introduced on the A90, three-in-five vehicles were speeding. Now 99-in-100 vehicles are complying with the speed limit.”