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:

Mentoring of Design Team for Two Ottawa Area Roundabouts:
Delphi-MRC provided mentoring/peer review services for the MRC design team who were tasked with carrying out a detailed design of two Ottawa area roundabouts. Challenges associated with urban/rural transitions, multi-lane approaches and their operations, as well as increased volumes of heavy vehicles were all addressed and overcome. Appropriate lane marking and signage plans were also provided to the design team based on industry guidelines.

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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