|Length:||7.7 mi (12.4 km)|
|Existed:||1972 – present|
The first section of the M621 to open, known at the time as the 'South West Urban Motorway', extends from the M62 to Junction 3 in central Leeds where it used to terminate at a roundabout which was also the terminus of the M1 motorway. This section opened in stages, from the M62 to Junction 1 in 1971, and from Junction 1 to Junction 3 in 1973.
When the M1 was diverted away from Leeds when the 'M1 – A1 Lofthouse to Bramham' extension opened in 1999 adjustments were made to Junction 3 and the Leeds section of the M1 was re-designated as M621 (Junctions 3–7).
|M621 motorway junctions|
|Eastbound exits||Junction||Westbound exits||Coordinates|
|Start of motorway||M62, J27||Manchester, Bradford, Liverpool M62
Batley, Dewsbury A62
|Farnley, White Rose Centre A6110||J1||Farnley, White Rose Centre A6110|
|Armley, Elland Road A643||J2||Armley, Elland Road A643|
|City Centre A653||J3||City Centre A653|
|Hunslet (A61)||J4||Hunslet (A61)|
|Belle Isle, Leeds, Middleton, Leeds||J6||No access|
|Stourton (M1 North, A1) A639||J7||Stourton, Leeds (East) A639|
|The South, London, Wakefield M1||M1, J43||Start of motorway|
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