Abstract Manager

The AQSB Renewal Project, a $47 million urban reconstruction initiative, represents a significant achievement in urban infrastructure and transportation engineering. Located at the western edge of Ottawa’s downtown core, this project addressed the complex intersection of three major urban arterials as they traverse a minor escarpment. The AQSB project was strategically aligned with the construction of the new Ādisōke (Ottawa Public Library and Library and Archives Canada) joint facility, adding layers of complexity to design and construction coordination.

The project involved the realignment of Slater Street, the reconfiguration of intersections, and the conversion of all reconstructed segments into complete streets with protected intersections. The existing condition was focused on the movement of motor vehicles. Sidewalks were narrow with no offset from travel lanes. A cycling connection had been retrofit but left much to be desired. There was no accessible path of travel due to steep slopes. There were 160 collisions in the 5 years prior to the redesign.

The transformation includes the construction of 2.5 km of sidewalks, 1.3 km of cycle tracks, and 5 protected intersections, significantly enhancing pedestrian and cyclist safety and comfort. Greater spatial separation from traffic was provided along street segments, and time-separated crossings were implemented at intersections wherever possible. Two local street segments were converted to 30km/h streets. Street trees were planted using the latest best practices for survival and maintainability in the Ottawa climate, providing shade and separation from traffic for AT users. A road safety audit was performed to maximize the safety of the final design.

A major challenge was the escarpment terrain. The existing street grades exceeded 9%, far above the target of 5% for accessibility. The project successfully flattened the road profile through key areas, providing an accessible route for pedestrians. The realignment of Slater Street also eliminated an unconventional 5-leg intersection, replacing it with a standard 4-leg intersection, which facilitated the implementation of a protected intersection while also improving safety for motorists.

Innovative solutions were implemented, such as the use of the old Slater Street road surface for AT connectivity during construction and the design of accessible bus platforms adjacent to cycling facilities, which used the latest emerging practices at the time of design. Contaminated soil was safely managed in-situ, avoiding the GHG emissions and landfill pressure associated with hauling and off-site disposal.

The outcomes of the AQSB project include improved accessibility and AT connectivity, particularly benefiting the equity-deserving project area which has many affordable rentals and a major senior center. The project strengthened the crosstown bikeway and added new cycling connections. The water distribution system was enhanced, supporting future residential intensification, and the separation of over 800 meters of combined sewers reduced overflow events, improving water quality in the Ottawa River.

The AQSB Renewal Project exemplifies how comprehensive urban reconstruction can address multiple transportation and infrastructure challenges, providing valuable lessons for other municipalities undertaking similar projects. The successful completion of this project was celebrated locally, highlighting its positive impact on the community and the broader Ottawa area.