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|Perth, Dundee, Forfar, Stonehaven, Aberdeen, Peterhead|
From Edinburgh, the A90 travels west and connects to the M90 motorway bypass route that leads to the M9: however, it is only possible to travel northbound when reaching this connection. After connecting with the M90, it runs as a short section of A-road before turning into the M90 properly at the Queensferry Crossing. At Perth, the M90 again becomes the A90, now running north east to Dundee and through the Kingsway road system. It then passes Forfar, Brechin and Stracathro (the site of an ancient Roman Camp).
After crossing the Cowie Water just north of Stonehaven, a new (2019) junction takes the A90 road north as part of the Aberdeen Western Peripheral Route (AWPR), bypassing the city to its west past the suburban developments of Peterculter, Milltimber Westhill and Kingswells, turning east past Aberdeen Airport and Dyce. Meanwhile while the road previously known as the A90 continues as the renamed A92 via Newtonhill, Portlethen, Cove Bay, the urban area of Aberdeen and Bridge of Don), rejoining the A90 at the village of Blackdog where the AWPR terminates. Proceeding north, the route crosses the Ythan Estuary near Ellon, skirting Peterhead on its way to Fraserburgh. The A952 road via Mintlaw serves as a more direct inland bypass to the A90 road in its northerly extent.
The Dundee to Aberdeen stretch of the A90 is notorious for speed cameras. Previously, the 60-mile (97 km) trip from Dundee to Aberdeen along the A90 entailed over a dozen speed cameras including a majority of fixed Gatso types as well as locations used by mobile camera vans. These cameras were found on long fast stretches of road, and shortly before dangerous junctions, such as at the Laurencekirk junction where a 50 mph (80 km/h) speed limit is in force. This was introduced due to this junction's appalling safety record. A similar speed restriction was imposed at Forfar until two new grade-separated junctions were built, after which the restriction was lifted. In 2017 Average Speed Cameras were erected between Dundee and Stonehaven, with 15 per side, spaced approximately every 5 miles for a total of 30 cameras. BBC News reported in January 2018 that speed limit compliance had increased from 2 in 5 to 99 in 100 drivers.
The A90 was extended considerably on 30 March 1994 so as to give a continuous route number from Edinburgh to Aberdeen, since the A90 originally stopped at Inverkeithing. The former A85 went from Perth to Dundee; the A929 Kingsway through Dundee and then towards Forfar; the A94 from Forfar to Stonehaven; and the A92 from Stonehaven to Fraserburgh. The A92 did not go to Peterhead. The evidence of the numbering change can still be seen on the older road signs along the route where the original route numbers have been covered over with "A90" plates.
A short stretch of the A90, from the southern terminus of the M90 to Barnton Junction (a junction with the A902), is part of Euroroute E15, which runs from Inverness to Algeciras in Spain. The E15 continues northwards on the M90, and southwards on the A902 leading to the Edinburgh City Bypass.
- "Driver behaviour 'transformed' by A90 average speed cameras". BBC News. BBC. Retrieved 10 June 2019.
- Gordon Liberal Democrats. "Radcliffe and Bruce welcome A90 Victory". Retrieved 8 September 2007.[permanent dead link]
- Information on the Transport Scotland government site Archived 12 December 2013 at the Wayback Machine