A Planning Model for Determining Optimal CMS Locations on a Freeway-Arterial Network

This paper presents an optimization model for locating Changeable Message Signs (CMS) on an integrated freeway-arterial network. Compared to existing models, the proposed model represents a well-balanced compromise between computational efficiency required to solve problems of realistic size, and model realism to ensure the quality of solutions. The model has three unique features: (1) it recognizes that locating CMS is a planning problem that must take into account both current and future needs and benefits; (2) it evaluates CMS benefits over multiple time periods with different traffic distributions; (3) it explicitly considers inherent variations in incident characteristics across links and over time. A sensitivity analysis is performed to examine the potential impacts on optimal CMS locations resulting from uncertainties in various input parameters such as traffic demand, incident attributes and driver behaviour. Lastly, the proposed model is applied to the Highway 401 express-collector freeway system in Toronto and CMS location solutions are examined.