Work on installing fixed speed cameras along the M4 through Newport are finally set to begin this week after several months of delays.
Plans to introduce a fixed 50mph average speed limit on the M4 between junction 24 Coldra and junction 28 Tredegar Park were originally put on hold in April due to the outbreak of the coronavirus pandemic.
Last month Welsh Government said the works would start in the New Year, but it's now been confirmed that they will be starting this week and will be in operation from March 2021.
The Welsh Government's traffic information service, Traffic Wales, said the majority of the scheme would be done through closures of lanes one and two or two and three at one time.
But it said some total closures of the road would be required to complete the gantry works, finalise signs in the verge and central reserve, and to remove road markings on all lanes unobstructed.
The work will be undertaken overnight from Monday to Friday between 8pm and 6am.
Established in June last year, the South East Wales Transport Commission was asked by First Minister Mark Drakeford to look into alternatives to the proposed M4 relief road, which the Welsh Government said last year it would not build.
In December, the commission made short-term recommendations which included scrapping the current variable speed limit and replacing it with a fixed 50mph limit.
In August, Mark Drakeford reiterated that the decision to scrap the proposed £1.4 billion relief road in Newport would not be revisited and that he would be "concentrating on the alternatives" for solving the major traffic problems in the area.
"That decision is over. There is no point in people hankering back to it, it prevents people from concentrating on the alternatives that we want to put in place in Wales," he told BBC Radio Wales at the time.
