Global Practices on Road Traffic Signal Control

2006

This dissertation is a result of the research project entitled "Development of models for impact analysis of road traffic facilities (EMV)" funded by the Swedish Road Administration (SRA). Professor Karl-Lennart Bång, Division of Transport and Logistics (ToL), has been my supervisor and has provided very valuable advice and guidance throughout my work for which I am deeply grateful. This work is a product of assistance and support of many people. I would like to express special thanks to the following colleagues: Andrew Cunningham and Jeffery Archer, with whom I have written two papers, which are incorporated in this thesis. Their contribution has mainly been in software programming of the evaluated signal control strategies. Carlos Moran and Johan Wahlstedt, who have assisted with field data reduction. Carlos has also contributed with driver behavior analysis. Stefan Eriksson, Lennart Leo, and Björn Bergman, who helped out with field measurements. In addition, many thanks to Albania Nissan, who supported me with her humor and generosity; and to other colleagues working at our division, who helped me with various details, especially Brigitt Högberg, Katarina Fogelström and my project colleague Karin Aronsson.

2010

This paper presents the practices of local government units outside Metro Manila on traffic signalization of unsignalized intersections. The information revealed in this research is based on the perspectives of the local officials of the 23 cities or 23.46 % of the 98 cities in the Philippines excluding the 14 cities of Metro Manila. Most of the city respondents are thickly populated. Majority of them are first class cities wherein there is a yearly increase in the number of registered motor vehicles. The level of necessity and level of attainment of objectives for traffic signalization are Very High and High, respectively. Some of the LGUs have not installed traffic signals because of budget constraints. They tap the expertise of the Traffic Engineering Center (TEC), Traffic Engineering and Management (TEAM), and the academe (e.g. National Center for Transportation Studies) for the conduct of traffic engineering studies. TEC warrant is the most frequently used criterion considering...

2016

Traffic is formally organized in many jurisdictions, with marked lanes, junctions, intersections, interchanges, traffic signals, or signs. Traffic is often classified by type: heavy motor vehicle (e.g., car, truck); other vehicle (e.g., moped, bicycle); and pedestrian. Different classes may share speed limits and easement, or may be segregated. Some jurisdictions may have very detailed and complex rules of the road while others rely more on drivers' common sense and willingness to cooperate. Organization typically produces a better combination of travel safety and efficiency. Events which disrupt the flow and may cause traffic to degenerate into a disorganized mess include: road construction, collisions and debris in the roadway. Signs evolved from local practice, cities and states copying neighbors, and inventing what they needed, and then later standardizing (first for rural and urban areas separately, and then jointly) after the value of coordination became apparent when auto...

2000

Under these conditions the authority will soon justify the installation of a traffic signal, which many perceive as the answer to all traffic congestion problems. A traffic signal that is properly justified, designed, installed, operated and maintained can have many positive and real benefits. On the other hand, however, a poorly motivated and designed traffic signal can be particularly inefficient and unsafe. In many cases traffic signals are inappropriately installed due to poor evaluation of prevailing conditions.

The Austroads Guide to Traffic Management has 13 Parts and provides comprehensive coverage of traffic management guidance for practitioners involved in traffic engineering, road design and road safety. Part 1: Introduction to the Guide to Traffic Management introduces the discipline of traffic management and an overview of the structure and content of the Guide. It outlines the breadth of the subject, the distribution of content among the various Parts of the Guide, and the relationship with other Guides such as those for Road Design and Road Safety. Part 1 introduces traffic management in a practical context, and presents fundamental definitions, principles and objectives. It introduces functional road hierarchy as an essential concept, and outlines the basic elements of traffic management and their application. It provides an overview of how the various parts of the Guide would typically be used by a wide range of practitioners.

IOP Conference Series: Materials Science and Engineering

Frequent evaluations are required to upgrade mobility and safety at intersections. This thus paper proposes a typical scenario to identify suitable controls for installing appropriate traffic signals. Five individual intersections were studied within the Babylon province, of Iraq, and graphical methods were used to identify suitable controls. Three graphs were adopted based on recommendations from the Institute of Highway Transportation (IHT), Department of Transportation (DoT) and the Iraqi Highway Design Manual (SORB). In addition, warrants for traffic signal installation according to the Manual Uniform Traffic Control Devices (MUTCD) regulations were checked with HCS 2010 software. According to IHT recommendations, three of the five intersections should be of a priority type and the others should take on a grade separation and a roundabout or a similar signal type. According to DoT, three of five intersections should be roundabouts and the rest Ghost Islands. The SORB recommends that all intersections should be controlled or altered to interchanges. Optimisation of suitable controls for each site should thus take all three methods into account in view of restrictions on area and budget. According to MUTCD, all of the intersections justify the installation of traffic signals, though further evaluation complementary to the proposed scenario would be useful.

International Journal of Intelligent Transportation Systems Research, 2010