Traffic Signal Design Guide & Timing Manual

2006

14. Sponsoring Agency Code DTRS98-G-0028 15. Supplementary Notes

2009

Changes in technology have an impact on standard practice, materials, and equipment. The traffic signal industry is constantly producing more energy-efficient and durable equipment, better communications, and more sophisticated detection and monitoring capabilities. Accordingly, this project provides an update to the traffic signal content within the Statewide Urban Design and Specifications (SUDAS) Design Manual and Standard Specifications. This work was completed through a technical advisory committee with a variety of participants representing contractors, the Iowa Department of Transportation, cities, consultants, vendors, and university research and support staff.

Transportation Research Record: Journal of the Transportation Research Board, 2012

This paper proposes an agile, scalable approach for an agency to use for defining a design space for parameters of traffic signal controllers that reflect the agency's procedures. This design space is more commonly known as a checklist of parameters that must be configured in a controller database. The procedure for establishing this design space used simple network-monitoring protocol messages from programmed traffic signal controllers to traverse the controller database tree systematically with the get-next command that was available on controllers that supported the National Transportation Communications for Intelligent Transportation System Protocol (NTCIP). In the case study, a corridor of 22 intersections (five isolated and 17 coordinated) was analyzed to establish the design space empirically. The controllers that were studied had approximately 74,000 configurable parameters, although many of these are seldom configured by most agencies. Longitudinally along a five-inters...

Roundabout Planning, Design, and Operations Manual, 2017

This manual provides guidelines and recommended practices for planning and designing roundabouts in the State of Alabama. This manual cannot address or anticipate all possible field conditions that will affect a roundabout design. It remains the ultimate responsibility of the design engineer to ensure that a design is appropriate for prevailing traffic and field conditions. 9.2.

In the previous chapter, a simple design of cycle time was discussed. Here we will discuss how the cycle time is divided in a phase. The performance evaluation of a signal is also discussed.

Encyclopedia of Business Analytics and Optimization, 2014

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… Research Board 79th …, 2000

The Phoenix Metropolitan Model Deployment Initiative (MMDI) is a seven-year project that attempts to develop and integrate intelligent transportation systems for the Phoenix Metropolitan area. As part of this project, this paper provides some insight as to the potential benefits of coordinating traffic signals across jurisdictional boundaries along the Scottsdale/Rural Corridor in the cities of Tempe and Scottsdale, Arizona. In addition, the paper demonstrates the feasibility of using GPS second-by-second speed measurements and simulation tools for the evaluation of environmental and safety impacts of operationallevel traffic improvement projects. The simulation results demonstrate the unique opportunities that simulation tools provide for conducting different sensitivity analyses and for the evaluation of conditions that are not necessarily observed in the field. Finally, the paper demonstrates that optimizing the location of the break in traffic signal coordination can impact the efficiency of travel, the environment and the number and severity of vehicle crashes.

Due to budget constraints, most of the traffic signals in the US are retimed once every 2-5 years. Despite that, traffic delay increases 3-5% per year with outdated timing plans. It would be desirable to reduce the signal retiming costs by automating all or a portion of the manual process. This research takes one step forward in this direction. In this project, we develop a performance visualization and fine-tuning tool for arterial traffic signal systems, aimed at reducing the labor costs for signal retiming. Using high-resolution event-based data from the SMART-Signal system, a set of easy-to-use algorithms are developed to refine traffic signal systems. Specifically, a framework is developed to diagnose operational problems regarding cycle lengths, green splits and offsets. Then, algorithms for offsets and green splits fine-tuning are proposed. To fine-tune offsets, a practical procedure to construct time space diagram (TS-Diagram) to visualize the progression quality on arterials is proposed and validated. For green splits, an adjusted measure of effectiveness (MOE), the utilized green time (UGT), is proposed for performance evaluation. Moreover, a practical procedure for time of day (TOD) transitions is also developed to generate optimal timing plan schedules. Field case studies and simulation experiments are carried out to illustrate and validate the proposed algorithms. The algorithms could be used during the retiming process to help agencies reduce labor costs, or to periodically refine traffic signal systems for coordinated arterials.