Urban Transportation and Logistics

92 Wai Yuen Szeto and Rojee Pradhananga

consideration of both the equity in the spatial distribution of risk and

thetotal risk involved. The problem can be classied into

• The global route planning problem with equity

• Hazmat transportation network design

The global route planning problem with equity determines routes that

minimize total risk subject to equity constraints. This problem is still a

single-level optimization problem but can be extended to consider mul-

tiple objectives.

The hazmat transportation network design problem is to choose road

segments that should be closed for hazmat transportation to minimize

total risk, given an existing road network. This is a bilevel optimization

problem. The upper level problem involves the gov ...