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Topic: Re:Re:Widening of the M4
Posted by: Richard Jennings
Date/Time: 20/06/15 23:35:00

"Probably planning for the extra traffic created by the new runway at Heathrow."

It's part of a much larger programme by Highways England to make better use of existing motorway land by converting 3-lanes-plus-hard-shoulder into 4 lanes of 'smart' (formerly 'managed') motorway with variable speed limits. By providing the extra lane when needed and controlling speeds, you get a much smoother flow of traffic which should reduce pollution, which is often increased on the M4 because of stop-start traffic.

The problem is that when the first part of the M4 was built in 1961-63 (Slough and Maidenhead by-passes), it had only 2 lanes per carriageway. It was widened on the cheap to 3 lanes around 1970 without widening the bridges, so there are at least 10 bridges on that section without hard shoulders under them.

Basically the M4 is unfit for purpose, and has been for 30 years.  Converting it to a managed motorway is good news IMHO.

Rima, do you have a reference to any study that quantifies the increase in pollution that you claim?

Entire Thread
TopicDate PostedPosted By
Widening of the M420/06/15 19:58:00 Rima Jones
   Re:Widening of the M420/06/15 20:04:00 Will Watson
      Re:Re:Widening of the M420/06/15 22:19:00 Rima Jones
         Re:Re:Re:Widening of the M421/06/15 08:09:00 Rima Jones
      Re:Re:Widening of the M420/06/15 23:35:00 Richard Jennings
         Re:Re:Re:Widening of the M421/06/15 09:34:00 Elizabeth Jane Daley
            Re:Re:Re:Re:Widening of the M421/06/15 12:51:00 David McLoughlin
               Re:Re:Re:Re:Re:Widening of the M421/06/15 13:11:00 Rima Jones
         Re:Re:Re:Widening of the M421/06/15 20:35:00 Tim Henderson
            Re:Re:Re:Re:Widening of the M406/09/16 18:14:00 Tim Henderson
               Re:Re:Re:Re:Re:Widening of the M406/09/16 18:29:00 Viv Griffiths
                  Re:Re:Re:Re:Re:Re:Widening of the M407/09/16 00:07:00 Richard Jennings

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