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Traffic Forecasts

Volume 32: debated on Thursday 18 November 1982

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asked the Secretary of State for Transport what were the traffic forecast figures used in the design of the M4 (Severn Bridge), the M53 (Liverpool), the A470 (Cardiff), the M3 (Frimley-Lightwater), the M4 (Reading), the M6 (Gravelly Hill), the A3 (Hog's Back Flyover), the M5 (Taunton), the Al9 (Cleveland) and the A2 (Dover Harbour); and what are their present measured traffic volumes.

The available information for roads in England is as follows. The A470 (Cardiff) is the responsibility of my right hon. Friend the Secretary of State for Wales.


Design Forecast

Latest available traffic count

Year of forecast


Year to which forecast relates





24-hour AADF(vehicles)

M4 (Severn Bridge)‡ Junctions 21–22[1966]Average 24-hour day[1980][33,000]198133,000
M53 (Wirral) Junctions 2–31966Evening Peak (1 hour)19905,000197925,000
Junctions 4–51966Evening Peak (1 hour)19905,500198026,000
M3 (Frimley-Lightwater) Junctions 3–41967Average 24-hour day198248,000198142,000
M4 (Reading) Junctions 9–101964Average 16-hour day198274,000198056,000
Junctions 11–121964Average 16-hour day198244,000198142,000
M6 (Gravelly Hill) Junctions 6–7Data not readily available198078,000
A3 (Hog's Back Flyover)Data not readily available198027,000
M5 (Taunton) Junctions 24–251970Average 16-hour day198441,000198019,000
Al9 (Cleveland)1968Average 16-hour day198331,000197932,000
A2 (Dover Eastern Harbour)1974Average 16-hour August day19905,500197916,000


* 2-way flows.

† Annual Average Daily Flow—2-way.

‡ Design year forecast not readily available. The forecast shown was made in 1966 for the purpose of fixing tolls.

║Assuming the completion of the M20 to Folkestone and its extension to Dover (West).