Spiral markings at signalised roundabouts improve traffic flow but can reduce safety due to poor lane discipline. This paper describes an innovative method of improving lane adherence at signalised spiral-marked roundabouts through the use of intelligent road studs.
To achieve this, a before-and-after case study of a major spiral-marked, traffic signal controlled roundabout on the Edinburgh City Bypass was undertaken. The research revealed a substantial reduction in lane transgression at the roundabout and a corresponding reduction in collision rate.
Since its installation, the success of the scheme has been recognised with six national transport awards.
Llewellyn, R. (2017, September). Improving Lane Adherence at Signalised Roundabouts with Intelligent Road Studs - A Case Study. Paper presented at JCT Traffic Signals Symposium