Transportation infrastructure issues are at present attracting attention in North America due to their maintenance and rehabilitation needs. Although there is recognition of their role in sustainability of cities, regions and the country, the poor physical condition of infrastructure will not enable these facilities to fulfill their sustainability role. The location and design of highway infrastructure were guided mainly by functional considerations rather than using these as instruments of sustainability. In addition, for good reasons, the initial cost was subjected to scrutiny, but this occurred at the expense of the important role of life cycle cost in shaping economic parameters of sustainability. A number of sustainability rating schemes have become available around the world. The development, improvement, and promotion of the ENVISION tool for planning and rating infrastructure projects has much potential to improve sustainability including a formal recognition of the importance of life cycle analysis. To go beyond the current state of knowledge, research is needed in the identification of cost overrun variables through factor analysis, models of cost overruns, and treating risk and uncertainty in life cycle analyses. Cost overrun models are reported in the paper and inferences are drawn on the use of these models as a part of treating risk on a life cycle basis. This will be a contribution towards enhanced infrastructure planning and management, including the informed application of tools for planning and evaluation of highway infrastructure projects.

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Conference 2019 Canadian Society for Civil Engineering Annual Conference, CSCE 2019
Alfasi, B. (Baraa), & Khan, A. (2019). Enhancing sustainability in highway infrastructure: Risk analysis modles. In Proceedings, Annual Conference - Canadian Society for Civil Engineering.