Describe the procedure used in Great Britain for the design of highway weaving sections.
The predicted future design hour traffic flows through a weaving section between interchanges on an urban all-purpose 7.3m dual carriageway which serves as a primary distributor are shown below. The weaving section is straight with a length of 500m and has an overall gradient over a length of 0.5km upstream and downstream of the weaving section of less than 2 per cent. The maximum hourly flow for the design of the weaving section is 1600 vehicles per hour per lane and the design speed for the highways upstream of the weaving section is 80 kilometres per hour. The percentage of heavy goods vehicles in the flow is 10 per cent. Calculate the number of lanes required in the weaving section.
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