Arterial Road Rehabilitation
The City has a road network of approximately 3,680 lane-kilometers (lane-km) of paved roads. Approximately 1,465 lane-km of roadway are classified as Primary Collector, Arterial, Freeway, or Expressway roads which carry on average 20,000 to 45,000 vehicles/day. The remainders are Secondary Collector and Local roads. The City of London, Transportation Planning and Design Division has an annual Life Cycle program to repair and resurface the main arteries. Where feasible, work is coordinated with other infrastructure (sewer/watermain) repairs or road widening projects which sometimes results in the road surface deteriorating beyond a desirable condition as funding allocations do not always coincide.
Typical treatments utilized to maintain our roads include crack sealing, mill & pave, expanded asphalt with overlay, mat replacement, and/or full reconstruction. New technologies and materials continue to evolve and the City actively tries new methodologies in order to get the best value for our dollar.
Transportation Structure Maintenance
Transportation Planning and Design Division is responsible for the long term needs and management of the City’s transportation structures. With the convergence of the North and South Branch of the Thames River, major CP and CN Railway hubs, and the NAFTA Highway traversing through the City’s boundaries, London is a ‘bridge' city. Currently, within the 420 square kilometres that makes up the City of London, there are approximately 210 major structures in the City’s inventory, including 102 bridges, 94 large culverts, 7 pedestrian tunnels and 4 large pedestrian bridges ranging in age from brand new to 138 years old. These structures, along with minor pedestrian bridges, retaining walls and overhead sign structures are inspected every two years by a Professional Engineer in order to maintain a long term structure management system and optimize available funding for structure repairs, rehabilitations and replacements. Work on the structures is identified and prioritized as immediate, mid-term, and long-term with a 0-5, 6-10 and 11-20 year work plans developed for major and minor rehabilitations, normal and routine repairs, and/or replacement.
Rout and Seal Program
The City of London has always been proactive with managing transportation infrastructure, by treatments being applied systematically and regularly during the life of the asset. This approach has proven to decrease the life-cycle infrastructure costs while maintaining a higher level of service throughout the life of the pavement. With water being the most destructive element to pavements and bridges, filling or sealing pavement cracks to prevent water from entering the base and subbase will extend the pavement life by three to five years.