Converting conventional and unconventional intersections to Modern Roundabouts

Delphi-MRC has been involved in the evaluation of roundabouts from a road safety and traffic operations perspective for several years. Our most recent undertakings that include:

Armdale traffic circle in Halifax, Nova Scotia
This is the first known conversion of a multi-lane traffic circle to a modern roundabout in Canada. With it comes many challenges which were overcome through a detailed and highly complex evaluation programme developed and managed by Delphi-MRC. An understanding of the current geometric issues and driver behaviour was required in order to develop a modern roundabout design that worked with these constraints.

Travellers Rest intersection in Summerside, PEI
Delphi-MRC provided peer review services for the design process and supplementary analysis towards a successful conversion of a two-way, STOP-controlled T-intersection to a modern roundabout in Prince Edward Island. This intersection is an integral part of PEI’s arterial roadway network and the intersection is located in a rural, high speed environment – presenting a unique set of challenges. Our analysis was carried out using the VISSIM microscopic simulation software and the road safety and traffic operations benefits were presented at a public meeting. Critical to the conversion to a modern roundabout was proper speed management techniques and signing on the approaches to the modern roundabout.

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