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The companion guidebook (0-5485-P2) developed as part of this study provides the procedures and methodologies for effective use of historical incident data at Texas Transportation Management Centers (TMCs). This research report do...
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The companion guidebook (0-5485-P2) developed as part of this study provides the procedures and methodologies for effective use of historical incident data at Texas Transportation Management Centers (TMCs). This research report documents the results from the case studies conducted using the procedures outlined in the guidebook. Researchers examined the data collected from three Texas TMCs, which are Houstons TranStar, Austins Combined Transportation and Emergency Communications Center (CTECC), and Fort Worths TransVISION. Researchers conducted six categories of analyses in this study (1) analysis of incident characteristics, (2) hot spot analysis, (3) incident impact estimation, (4) analysis of incident management performance measures, (5) incident duration prediction, and (f) incident-induced congestion clearance time prediction. Researchers found that historical incident data can be effectively used to support incident management and performance evaluation processes both reactively and proactively. Some procedures need to be automated to be used efficiently in day-to-day operations. As such, various prototype tools, such as the incident duration and incident-induced congestion clearance prediction tools, were developed during this study to facilitate and automate the proposed methodologies. These prototype tools provided a platform for TxDOT to deploy the research results in the future.
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This document discusses various aspects of traffic control for incidents with the focus on the traffic control roles and responsibilities of the responders as well as the safety of the responders and the motoring public. It also r...
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This document discusses various aspects of traffic control for incidents with the focus on the traffic control roles and responsibilities of the responders as well as the safety of the responders and the motoring public. It also recognizes that active traffic management is necessary to meet the fluctuating needs of the scene and to minimize clearance and recovery time. An overview of popular state laws and policies enacted to support safe, quick clearance is provided. The roles/responsibilities of the various categories of responders are addressed. Available traffic control devices are discussed. There is also focus on the affects on traffic control created by the dynamic nature of incident clearance. Highlights some best practices to enhance traffic control implementation are included.
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The TRANSMIT System is a unique application of AVI technology for traffic211 management purposes. Not only does it provide engineers with travel time (and 211 speed) data for the main line sections of their facilities, but it is a...
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The TRANSMIT System is a unique application of AVI technology for traffic211 management purposes. Not only does it provide engineers with travel time (and 211 speed) data for the main line sections of their facilities, but it is also used 211 to detect traffic incidents. Through geographical expansion and technology 211 enhancements, the TRANSMIT system will continue to provide engineers and planners 211 with additional capabilities, such as the ability to measure O/D patterns, 211 estimate traffic volumes, provide in-vehicle motorist information, and manage 211 transit fleets, Effective traffic management results from a combination of good 211 motorist communication and the establishment of a high level of confidence on the 211 part of the motorist in the accuracy and reliability of the information being 211 received. TRANSMIT is ideally suited for regions experiencing high levels of 211 traffic congestion, having a significant number of vehicles equipped with AVI 211 transponders, and having a large number of alternate routes as is the case in the 211 New York/New Jersey/Connecticut Metropolitan Area.
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In 2004, the Federal Highway Administration published updated rules governing work zone safety and mobility; all highway construction and maintenance projects using federal-aid highway funds are required to develop transportation ...
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In 2004, the Federal Highway Administration published updated rules governing work zone safety and mobility; all highway construction and maintenance projects using federal-aid highway funds are required to develop transportation management plans (TMP) focusing on safety and the reduction of traffic mobility impacts through coordination. The project TMP should consist of a collection of administrative, procedural, and operational strategies for managing and mitigating the impacts of work zones. It is important for planners, operations personnel, and incident responders to understand why the transportation operation elements are vital in the process of developing the TMP. This document addresses the special needs and concerns when managing traffic incidents within a work zone and focuses on incident management as a strategy to be considered in the transportation operations component of the TMP. A description of techniques and strategies that can be used to handle incidents in work zones is presented Some trend-setting approaches used on high-profile construction projects are also showcased as examples of good incident response planning incorporated at the design level. The contractors role in dealing with incidents within the work zone is addressed as well as the description of processes, procedures, and practices related to the detection, response, and clearance of incidents. The importance of including incident management procedures as an element of the transportation operations component of these plans is emphasized. The goals, objectives, and reasons for incident management as well as the issues and concerns that work zone planners, incident responders, and traffic operators need to consider in the planning phases of a work zone project are presented. Common work zone incident management strategies are described.
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Traffic incidents are a major source of congestion in both urban and rural areas. Nationally, roughly 25 percent of total congestion is due to traffic incidents. Further, traffic incidents create unexpected congestion congestion t...
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Traffic incidents are a major source of congestion in both urban and rural areas. Nationally, roughly 25 percent of total congestion is due to traffic incidents. Further, traffic incidents create unexpected congestion congestion that occurs in times and places where travelers dont expect to be delayed and are therefore a major source of frustration for travelers. Implementing Traffic Incident Management (TIM) strategies has proven to be a highly cost-effective way of treating congestion problems. However, a strong need exists to be able to predict what the impacts of TIM strategies will be at the planning stage of project development and to monitor the effects of TIM programs. To support modeling and evaluation of TIM strategies, this document provides a synthesis of analysis, modeling, and simulation (AMS) methods for incident impacts. The focus is on incidents effects on congestion and reliability as well as secondary incidents, for the purpose of estimating benefits and evaluating programs and proposed strategies. This document covers several specific topics including: a synthesis of AMS methods for incidents, TIM AMS application areas, data required to undertake modeling and evaluations of TIM strategies, and identification of future improvements to TIM AMS applications.
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This report presents an analysis of freeway incidents on the Salt Lake Valley freeway network. Different types of incidents at the most common/difficult locations are analyzed through traffic microsimulation using VISSIM simulatio...
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This report presents an analysis of freeway incidents on the Salt Lake Valley freeway network. Different types of incidents at the most common/difficult locations are analyzed through traffic microsimulation using VISSIM simulation software. The analysis focuses on incident induced freeway delays, but it also looks into other parameters, such as vehicle throughput, travel times and network-wide delays. The goal of this project is to develop a set of incident management strategies that would help TOC operators to make decisions that will optimize their response in terms of time and resulted delay, and minimize users cost due to delay on the freeway network.
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Incidents are estimated to cause somewhere between 52% and 58% of total delay experienced by motorists in all urban area population groups, according to the 2010 Urban Mobility Report. The delay estimates differ depending on where...
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Incidents are estimated to cause somewhere between 52% and 58% of total delay experienced by motorists in all urban area population groups, according to the 2010 Urban Mobility Report. The delay estimates differ depending on where and what data are collected, and how delay caused by incidents is separated from recurrent congestion delay. More importantly, this delay cannot be predicted, whereas recurrent delay, by definition, is predictable. Among incidents that cause delay, there exists the so-called 10-90 rule: 10% of incidents account for 90% incident induced delay. The delay caused by the same type of an incident varies substantially depending on its exact location (e.g. relative to ramps, availability of shoulder) and, more importantly, on the state of traffic. The same incident, when traffic is very light or highly congested, contributes a smaller increase in delay than at other times. Clearance time significantly affects delay, especially when traffic is close to capacity: since queue lengths increase proportionally with clearance time, the freeway section will transition into congestion, and recovery will take longer. In many instances clearance time is prolonged for statutory reasons. For example, the Freeway Service Patrol is not allowed to move a vehicle to the shoulder if there is a serious accident: in case of injury, a Highway Patrol officer must be present before a vehicle can be moved. To reduce response (and hence clearance) time, it may be worth pre-positioning resources (Highway Patrol and tow trucks) to respond to incidents, but this is possible only if reliable statistical data of time and location of incidents are available.
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Incident management is the process of managing multi-agency, multi-jurisdictionalresponses to highway traffic disruptions. Efficient and coordinated management of incidents reduces their adverse impacts on public safety, traffic c...
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Incident management is the process of managing multi-agency, multi-jurisdictionalresponses to highway traffic disruptions. Efficient and coordinated management of incidents reduces their adverse impacts on public safety, traffic conditions, and local economy. This document focuses on managing the majority of traffic incidents through law enforcement, service patrols, HAZMAT, detection and verification, site management, and strategic planning for incident management.
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