Plans to increase capacity on the M4 have been announced by the government.
The scheme will see variable speed limits and the hard shoulder converted to a traffic lane for 31 miles between the A312 at Heathrow Airport to Theale.
The changes, which the Highways Agency estimates will cost between £614m and £862m, aim to reduce congestion, improve journey times and cut air pollution.Exhibitions on the plans are being held between 18-29 March.
Refuge bays will be placed along the motorway in place of the hard shoulder, where people in broken-down cars will be able to wait for rescue services – monitored by CCTV cameras.
If approved, the scheme could start in the early years of the next spending review period (post 2015).
Malcolm Bingham, from the Freight Transport Association, said: “Using all four lanes is new so we’ve got to look to see how we can educate the motorists so they’re not confused by it.”
Story: BBC News