Traffic Operations and Management

This report contains a user's guide and case studies, providing a recommended methodology to predict the long- and short-term mobile source emission impacts of traffic-flow improvement projects. Guidance is provided to evaluate the magnitude, scale, and duration of such impacts for a variety of representative urbanized areas.

This paper presents a person-based traffic responsive signal control system for transit signal priority on conflicting transit routes. A mixed integer nonlinear program is formulated that minimizes the total person delay at the intersection while assigning priority to the transit vehicles based on their passenger occupancy. The mathematical formulation consists of an improvement to previous formulations in that it ensures global optimality for undersaturated traffic conditions in reasonable computational time for real-time applications. The system has been tested at a complex signalized...

Travel time for an itinerary constitutes one of the most relevant roadway traffic metrics. Numerous studies have been conducted to estimate travel times on the basis of data from loop detectors. This article focuses on evaluating the performance of a set of estimation methods--algorithms that estimate route travel times using specific speed data from dual loop detectors for real-time applications, such as displaying travel times on changeable message signs. The travel-time estimates are evaluated against probe vehicle data obtained from FasTrak in the San Francisco Bay Area to determine...

This paper reports on the combined microsimulation and small scale demonstration evaluation of the freeway performance effects of a specific connected vehicle implementation of speed harmonization (The Prototype). The microsimulation testing was performed on a 10 mile stretch of freeway in San Mateo County, California. The small scale field demonstration was performed with 10 equipped vehicles on 17 miles of the I-5 freeway in Seattle, Washington. The microsimulation analysis evaluated the effects of the Prototype speed harmonization algorithm on shockwaves, queues, throughput, speed...