Highway Networks

This chapter discusses the operational evaluation of a highway system considering both freeways and arterials. Previous chapters have considered each of those facilities as an isolated system. However, when congestion occurs and queues spill back into a facility, the analysis should consider the entire freeway-arterial system (the concept is similar to the analysis of freeway systems discussed in Chap. 9 , when queues spread to upstream segments). The first section of this chapter discusses spillback from an arterial to a freeway, and the second section examines the impact of spillback from a freeway to an arterial. The last section discusses the performance measurement framework used in the HCM7 to assess highway networks.