M90 motorway
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| Route information | |
Part of  E15
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| Length: | 30.0 mi (48.3 km) |
| Existed: | 1964 – present |
| History: | Constructed 1964–80 |
| Major junctions | |
| From: | Junction 1a of the M9 |
 .svg){kind=small} A823(M) motorway |
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| To: | Perth (two ends; one east 56°22′58″N 3°24′23″W / 56.3827°N 3.4065°W, one at Broxden Junction 56°23′18″N 3°29′13″W / 56.3882°N 3.4869°W) |
| Location | |
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Primary destinations: |
Edinburgh, Edinburgh Airport, Forth Road Bridge, Dunfermline, Kinross, Perth |
| Road network | |
The M90 is a motorway in Scotland. It runs from junction 1a of the M9, at the south end of the Forth Road Bridge, to Perth, passing Dunfermline and Kinross on the way. It is the most northerly motorway in the United Kingdom, the northernmost point being a spur into the western suburbs of Perth at Broxden.
The first section of the M90 opened in 1964 to coincide with the opening of the Forth Road Bridge and Masterton junction (junction 2). The next section, Crossgates – Kelty and Cowdenbeath Bypass, opened on 1 December 1969, with the next section, Kinross and Milnathort Bypass, opening in May 1972.
The final two sections were due to begin construction around 1973/74, but due to the oil crisis, were put on hold. The next section from Arlary ( Jct 8 with A91) to Arngask was opened in March 1977, with the final section between Arngask (GlenFarg) and Muirmont opening in August 1980; which connected up with the completed Friarton Bridge and Perth Bypass to Broxden.
The M90's most substantial engineering feature is the Friarton Bridge in Perth, a tall concrete pillared structure which traverses the River Tay. The bridge carries eastbound traffic from Broxden towards Dundee and along the Firth of Tay. The Queensferry Crossing will open as part of the motorway in 2016.
The road constitutes most of the southerly part of the A90 corridor from Edinburgh, through Perth, Dundee and Aberdeen to Peterhead along Scotland's North Sea coast.
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