Abstract: 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.

Key words: changeable message, signs(CMS), location, optimization, traffic assignment, queuing theory

摘要： 提出了一个在有高速公路和城市干道的组合路网中设置可变信息标志(CMS)组位置的最优化模型．与文献中现有的模型相比较，本文的模型有效地达到了实际规模道路网络计算复杂性问题和确保求解模型的质量之间很好的平衡． 本模型具有三个不同的特征：(1)认为在路网中设置安装可变信息标志(CMS)系统是一个必须同时考虑现在和未来需要和利益的典型的规划问题；(2)评估由于在路网中设置了可变信息标志(CMS)系统而带来的交通效益是通过具有不同交通分布型态的多个时段来完成的；(3)考虑了在不同的路段上和时段内交通事件的特征本质上是变化的因素．本文还进行了敏感性分析，用以检验在各种不同的交通输入参数中，如交通需求、交通事件特征值、以及驾驶员交通行为的不确定性对可变信息标志系统(CMS)在路网中的最优设置的潜在影响．最后，本模型应用于加拿大多伦多的401高速公路和辅道组成的混合道路系统，并且对CMS系统设置结果进行了检验．

关键词: 可变信息, 标志, 选址, 优化, 路网, 排队