I was surprised by the comments attributed to John Dawson of the AA (NCE last week). The M4 bus lane will not bring more congestion; it already exists where the M4 narrows from three lanes to two at the approach to the elevated section. What it does do is make better use of the existing road space to enable a relatively small number of vehicles, carrying large numbers of people, to bypass the congestion. This is more effective than many expensive urban road schemes that merely move that congestion to a new location.
The AA could look at the historical facts; in the past 40 years or so, new traffic control systems have increased the number of vehicles that enter Central London at peak periods, but the number of people carried by these vehicles has decreased significantly due to the large decline in bus use.
G Nigel King (M), High Hedges, Cadmore End, High Wycombe, Bucks HP14 3PL