- 1 update
The Highways Agency has launched a consultation today to discuss the speed limit on a part of the M3 in Surrey for London commuters.
Rush-hour traffic slows to an average 45mph on the busy route in the morning and an average of 56mph in the evening.
The planned £174 million upgrade will transform a 13.4 mile stretch into a 'smart motorway' by adding an extra lane in both directions between Junction 2 and 4a.
This will increase capacity, reduce congestion and boost average speeds for motorists to cut 4 minutes per vehicle from a morning commute.
Due to the capacity increase however, emissions from the extra traffic are predicted to breach local air quality limits on a short selection of the route, unless it's limited to 60mph during certain times of the day.
Roads Minister Robert Goodwill said: