Drivers that flout the Variable Speed Limit restrictions in place along a busy stretch of the M4 around Newport will face tougher enforcement action.
The warning is being issued ahead of a new safety campaign being launched today which aims to ensure drivers are more aware of and adhere to the variable speed limits in place on the M4 between Junctions 24 (Coldra) and 28 (Tredegar Park) before enforcement action is stepped up.
The Welsh Government introduced a Variable Speed Limit along this stretch of road in 2011 to reduce congestion and improve safety and journey time reliability.
One lane is closed and there's very slow traffic after an accident on the M4 Second Severn Crossing Eastbound between the Toll Booths and J22 M49.
One lane closed and slow traffic due to accident, a motorcycle involved on M4 Westbound after J47 A48 / A483 (Penllergaer/Swansea West Services).
The M4 Eastbound is partially blocked, and there is very slow traffic, at J34 Miskin after a three vehicle accident.
The M4 Eastbound entry slip road has closed and there is heavy traffic after an accident involving a car and a lorry at J47 A48 / A483 (Penllergaer/Swansea West Services).
Emergency services are on scene after the car involved has ended up facing the wrong way.
There is a diversion in place and traffic will have to head West on the M4 to J48 and turn around to head East.
Alternatively, traffic can head along the old A48 (running parallel with the motorway) to J46 (Penllergaer)
The M4 Eastbound will close tonight at the Brynglas Tunnels in the first of a series of closures in either direction which will continue, with breaks, until February 2018.
The tunnels are being refurbished.
Traffic Wales says the M4 will be closed between junctions 25A and 26 from 8pm to 6am on up to five nights per week. The A48 Southern Distributor Road in Newport is the dedicated diversion route for all eastbound or westbound traffic.
The diversion will be in place between junctions 24 and 28 of the M4. But local traffic will be allowed to travel up to junctions 25a and 26 in order to access local routes.
Closures will usually be in place in one direction at a time but both tunnel bores may need to be closed for short periods of time for safety reasons.
Two lanes are blocked and there's very slow traffic because of an accident involving three vehicles on the M4 Eastbound between J25 (Caerleon) and J24 (Coldra).
The M4 Eastbound is blocked and there's stationary traffic because of a vehicle fire between J49 (Pont Abraham Roundabout) and J48 (Hendy/Llanelli).
Traffic is queuing for eighteen miles after an accident on the M4 Eastbound near Newport.
It happened at J27 (Highcross) just after 7 o'clock and is reported to have involved a number of cars and a motorcycle.
There's congestion to J34 (Miskin) and travel time is around 2 hours.
As a result, traffic is heavier than normal on J33 (Cardiff West And Services).
The A48(M) Eastbound is also affected before the M4 at J29.
There's congestion to J29a (St Mellons).
Two people have been taken to hospital as a result of the accident, with one person suffering severe but not life threatening injuries.
Two lanes are closed and there's queueing traffic after an accident on the M4 Eastbound between at J27 (Highcross).
There's congestion to J29 A48(M).