Highways Agency Reports

Abstract: This report isconcerned with a study ofGrade Separated Junctions undertaken in 1990/91. Findings from extensive survey related to how driver behave at current designs of merges, diverges and weaving sections on motorways and all-purpose roads. A notable feature is the incidence of "turbulance" in traffic flow caused by merging and diverging traffic. This turbalance affects all mainline traffic and reduces lane capacity on the mainline. This leads to flow brakdown at busy times, affecting all traffic.