Yorkshire M1, M62 Worcestershire M5 Northern Ireland Belfast M1, A12 Scotland Edinburgh M9, M90 Fife M90, A823(M) Under construction The following schemes are under construction: : J9-J14 (All lane running, Cost: £139 million, Estimated completion: 2023/24, Length: 11 miles) : J3-J12 (All lane running, Cost: £848 million, Estimated completion: 2022, Contractor: Balfour Beatty, Vinci (joint venture), Length: 34 miles) : J21A-J26 (All lane running, Cost: £100-£250 million, Estimated completion: 2022/23, Contractor: Costain, Length: 10 miles) : J4-J11 (All lane running, Cost: £244 million, Estimated completion: July–September 2021, Length: 14 miles) : J16-M42 J3A (All lane running (including conversion of existing controlled motorway), Cost: £133-£312 million, Estimated completion: 2023/24, Length: 2 miles) : J3-J4 (All lane running (including conversion of existing configurations), Cost: £133-£312 million, Estimated completion: 2023/24, Length: 5 miles) : J6-J8 (All lane running, Cost: TBC, Estimated completion: Spring 2022, Contractor: Galliford Try, Length: 4 miles) Planned schemes : J10-J16 (Through-junction running at junctions 10, 11 and 12, All lane running between junctions 15 and 16, Start date: 2021, Cost: £200-£400 million, Length: 19 miles) : J17-J18 (All lane running, Start date: 2024, Cost: £66-£338 million, Length: 2 miles) : J20-J25 (All lane running, Start date: January–March 2023, Cost: £283.2-£392.3 million, Length: 19 miles) A1(M): J6-J8 (All lane running, Start date: Road period 3 (2025-2030), Cost: TBC, Length: 7 miles) Withdrawn schemes : J19-J23A and J35A-J39 : M6 J8-J4A : M5 J4A-J3 : J5-J11 : J1-J4 and J24-J27 The above sections of motorway were included in the first five-year road investment strategy published in December 2014, however they have been removed from the second and current strategy. Sections of the M1 in Leicestershire and Yorkshire are billed to receive undescribed 'capacity improvements' in the third road period beginning in 2025. The M4 between junctions 24 and 28 near Newport in south Wales had its variable speed limit replaced with a permanent average speed camera-enforced 50 mph limit in early 2021. The Welsh Government believed that changing to a fixed limit would better reduce congestion and improve the quality of the air in the town. Timeline of introduction 1995 : J10-J15 (SI 1995/1094, Cost: £13.5 million (equivalent to £ million in ), Length: 14 miles) 2001 : J15-J16 (SI 2001/3763, Cost: £11.7 million (equivalent to £ million in ), Length: 5 miles) 2005 : J3A-J7 (SI 2005/1671) 2009 : J4-J5 (SI 2009/1571) : J16-M42 J3A (northbound) (SI 2009/1569) : J3A