Contractor: Balfour Beatty, Vinci (joint venture), Length: 34 miles) : J3-J4 (SI 2019/1158, Cost: £92 million (equivalent to £ million in ), Contractor: Carillion, Kier (joint venture), Length: 3 miles) 2020 : J13-J16 (SI 2020/956, Cost: £373 million (equivalent to £ million in ), Contractor: Costain, Galliford Try (joint venture), Length: 24 miles) : J2-J4 (SI 2020/47, Cost: £155-£234m, Contractor: Balfour Beatty, Vinci (joint venture), Length: 12 miles) : J8-J10 (SI 2020/79, Cost: £164 million (equivalent to £ million in ), Contractor: Carillion, Kier (joint venture), Length: 10 miles) : J10-J11 (westbound) and J11-J12 (SI 2020/85, Cost: £100-£250m, Length: 9 miles) 2021 : J13-J15 (SI 2021/116, Cost: £232.3-£335.4 million, Length: 16 miles) : J4-J11 (SI 2021/17, Cost: £244 million (equivalent to £ million in ), Length: 14 miles) Notes References External links M42 ATM Monitoring and Evaluation - Project Summary Report Motorways in England Road transport in the United Kingdom