Three multi-lane roundabouts are being implemented along Larry Uteck Boulevard in Halifax, Nova Scotia. Two are at the Highway 102 interchange, and a third is to the east at Nine Mile Drive/Starboard Drive. The use of roundabouts at highway interchanges is becoming common in many areas of the United States and in some Canadian provinces. The Nova Scotia Department of Transportation and Infrastructure Renewal (TIR) is constructing a series of roundabout interchanges, and the one at Larry Uteck Boulevard will represent the busiest and most ambitious to date in the province. Ourston Roundabout Engineering Canada developed the horizontal geometry of the roundabouts, and assisted with establishing signage plans and sightline envelopes, while CBCL Limited, a local consulting engineering firm, undertook detailed design. This paper discusses the capacity analysis and design process associated with developing the preliminary designs. This included determining appropriate lane configurations for the forecast traffic flows, recommending optimal locations for the roundabouts, deciding on the most appropriate right-turn treatments, optimizing the conceptual designs in terms of capacity, safety and cost (property impacts) and finalizing the horizontal geometry of the roundabouts.
