Collect traffic and travel time data from all traffic lanes because travel times can vary substantially between lanes. Travel time differentials exist across freeway work zone travel lanes, which…
The size and scope of the Atlanta CRD projects is reflected in the lessons learned from the project, which are also broad in size and scope.
Operation of HOT Lanes
Frequently communicate Express…
The following lessons were identified during the design and implementation process.
Identify functional boundaries and needs for cross jurisdictional control required to implement SCATS and TSP.…
Transportation Management Centers are established around the country to integrate data, information, and systems in support of day-to-day traffic and emergency operations. A primary challenge that…
An examination of databases and a sampling of locations reveal at least 12 metropolitan areas that are providing travel time messages on DMS. But at least 25 other metropolitan areas are gathering…
Based on interviews with developers of top traffic and transit information Web sites, recommendations were made on how Web sites should be developed, including the usability component of the Web site…
When implementing a new traffic information Web site, the technical staff should consider the likelihood of high usage of the system.
Prepare traveler information Web sites to accommodate high…
Design factors that influence long-term control center operations and maintenance are very important. This lesson recommends addressing noise and disruptions to TMCs through effective anticipation…
This document provides insight into the operations at various Transportation Management Centers (TMCs) within the United States and Canada. One subject discussed in this document is the lessons…
One subject discussed in this study is that certain security implementations should be considered for TMCs based on location and internal operations. Levels of security varied widely – some sites in…
Effective procurement techniques are key to acquiring the right facility, systems, and services at a reasonable price. The following lessons outline and suggest various procurement methods to use…
The experiences described in the Metropolitan Transportation Management Center Concepts of Operation study provide insight into the operations at various Transportation Management Centers (TMCs)…
An important challenge that the TMCs noted was related to selecting staff training and documentation methods to match individual Transportation Management Center (TMC) needs.
Implement sufficient…
One important topic highlighted by these experiences is the use of contractors for TMC maintenance support.
Recognize that contractors can be effectively used for TMC maintenance support. It is…
One area discussed is the design factors that influence long-term control center operations and maintenance. One important design factor is based on considering individual TMC needs and traffic…
One subject discussed based on these experiences is that map displays, computers, and software for transportation management centers (TMCs) should be selected based on minimizing cost and complexity…
Formalizing the incident management effort existing in many cities into an incident management program can make incident management a core agency activity at senior executive levels and demonstrate a…
While no single approach can be prescribed for all incident management efforts, a flexible framework based on experiences from successful incident management programs in the United States can be…
There is some form of incident management activity in most major and many mid-sized urban areas. Typically this involves each agency carrying out its own responsibilities, with primarily working-…
The Regional Traffic Incident Management Programs: Implementation Guide aims to explain general steps to implementation (with an institutional, rather than technical, focus), and is based on…
Utilize well-equipped safety service patrols to assist highway motorists after vehicle malfunctions or crashes, and to coordinate a safe and efficient response.
Safety service patrols keep…
METHODOLOGY
This study examined the effects of varying levels of SAS MPR (0%, 25%, 50%, 75%, 100%) on rear-end collision risks. Real vehicle trajectories, vehicle lengths, and signal timing were…
METHODOLOGY
This study proposed a combined VSL-RM algorithm designed to maximize freeway capacity by mitigating the capacity drop phenomenon at merge bottlenecks. The optimal speed of the VSL-RM…
FINDINGS
The first year of the Express Lanes produced mixed results.
During peak periods, travel times and speeds improved in the Express Lanes but declined in general purpose lanes, with a…
FINDINGSA Case Study in Atlanta, Georgia reported the following benefits:Reduction in Average incident durations from 67 to 21 minutes.Reduction in Vehicle-hours of delay of 7.25 million over one…
METHODOLOGYA before and after study was conducted to evaluate the effectiveness of both SCATS and TSP. For the SCATS study, travel time, delay, and stop statistics were recorded from probe vehicles…
RESULTSThe program resulted in an average 46-minute reduction in incident duration time and reduced incident delay by 7.25 million vehicle-hours. The NaviGAtor incident management program reduced…
RESULTSThe incident management program reduced secondary crashes in the NaviGAtor coverage area by 69 percent. It was estimated that the secondary crash rate was reduced from 676 to 210 crashes…
RESULTSThe incident management program reduced annual gasoline consumption by over 5.17 million gallons and decreased diesel consumption by nearly 1.66 million gallons per year. Fuel consumption…
RESULTSThe benefits above and the value of HERO motorist assistance resulted in a cost savings of more than 187 million dollars, which was used to calculate a benefit-to-cost ratio of 4.4:1. These…
RESULTSCustomer satisfaction with the incident management program was assessed using a survey conducted in November 2002. The criteria used to select the pool of participants for the mail survey…
This presentation provided an update of Georgia DOT (GDOT) Operational SPaT (Signal Phase and Timing) Deployments implemented as part of the nationwide SPaT Challenge sponsored by AASHTO. The…
Deteriorating performance of the high occupancy vehicle (HOV) lanes on I-85 during peak periods as a result of heavy usage provided the focus of the Atlanta congestion reduction demonstration…
Content references source material no longer available at its original location.
Growing congestion on metropolitan highway networks poses a substantial threat to the U.S. economy and to the quality of life of millions of Americans. Congestion pricing – sometimes called value…
The Atlanta Smart Corridor project evaluated the implementation of SCATS (Sydney Coordinated Adaptive Traffic System) and Transit Signal Priority (TSP) as an integrated system designed to improve…
Content references source material no longer available at its original location.
In 2005, the Georgia State Road and Tollway Authority (SRTA) received a grant through the Federal Highway Administration (FHWA) Value Pricing Pilot Program to investigate the application of value…