The region's first so-called smart motorway scheme has been officially opened this lunchtime allowing people to use the hard shoulder at peak times.
The roads minister, Robert Goodwill, unveiled the system on the M4 and M5 at the Almondsbury interchange. It uses various technologies to ease traffic flow. with overhead signs informing motorists when they can drive in the extra lane and what speed to travel.
Paul Unwin from the Highways Agency explains how the system works.
One lane is closed and there is heavy traffic on the M4 westbound due to spillage, recovery work and accident investigation work between J14 A338 (Hungerford) and J15 A346 Marlborough Road / 419 Marlborough Road (Swindon East).
A crime crackdown on the M4 in Wiltshire has seen three people arrested and the seizure of one and half tonnes of illegal tobacco. More than 100 fixed penalty notices were issued in the joint operation with tax officials. Two van loads of contraband alcohol were also impounded.