May 14th, 2014

St Isodore Catholic Church Expansion Traffic Impact Assessment (Ottawa, ON)


CastleGlenn Consultants Inc. was retained by Ralph Vandenberg Architect Inc. to prepare a Traffic Impact Brief (TIB) that would address the transportation and traffic issues in relation to a re-development application supporting the St. Isidore Catholic Church Expansion (from 4,530  to 12,380 square feet). The TIB was required to comply with the City of Ottawa’s “Transportation Assessment Guidelines” (October 2006).

The proposed site expansion would still be located at its existing lot (1135 March Road) at the north-west quadrant of March Road/Maxwell Road. The proposed expansion includes a total parking supply of approximately 230 stalls with internal roadway network and pedestrian facilities.

The proposed development is anticipated to result in negligible change to the traffic patterns and levels of service at the March Road /St. Isidore Catholic Church intersection and the March Road/Maxwell Road intersection.

The City of Ottawa voiced comments and concerns in relation to the proposed development and requested improvements to NB lanes fronting the site access and a SB right turn taper into the proposed development. It was concluded that the forecast southbound right-turn movement was not found to constitute a traffic operations concern. Improvements to the northbound lanes on March Road, and in particular the removal of the “chicane” feature fronting 1148 March Road, would best be dealt with when considering the re-zoning application for 1156 and 1170 March Road. In addition the removal of the “chicane” feature fronting 1148 March Road offers little benefit to the St. Isidore Church application.


Traffic impact assessment, traffic forecasting, traffic operations analysis and review, intersection spacing intersection capacity analysis, infrastructure assessment and gap acceptance analysis.

Role & Responsibility

Prime Consultant


Ralph Vandenberg Architect Inc.