Public consultation looks to ease the M4 flow

"The M4 Corridor Enhancement Measures Consultation will run until 06 June and provide the public with a number of different opportunities through exhibitions, workshops, response forms and websites to share the problems that they experience on this particular stretch of the M4 and voice their opinions on how best to tackle these issues."

http://wales.gov.uk/newsroom/transport/2012/120306m4consultation/?lang=en

Doubling the number of people per car would halve the number of cars on the road.