The A90 was extended considerably in the early 1990s, as it originally stopped at Inverkeithing. The former A85 went from Perth to Dundee, the A929 Kingsway went through Dundee and then towards Forfar, the A94 went from Forfar to Stonehaven, and the A92 from Stonehaven to Fraserburgh - it should be noted that the A92 did not go to Peterhead.
The A90 was extended considerably in the early 1990s, as it originally stopped at Inverkeithing.
A short stretch of the A90, from the southern terminus of the M90 to Barnton Junction (junction with the A902), is part of Euroroute E15 which runs from Inverness to Algeciras.
I am under claiming the ability of the A90, intentionally, when I state that the A90 will increase your ability to push through degrees in conduit and electrical piping, by a minimum of 200%.
The A90 is designed to rigid mount onto your Fish Tape using a unique side entry design.
The only other key to the attaching design is, once the A90 is mounted onto the fish tape, a few wraps of 33 electrical tape locks the A90 into place.