Evaluating Alternative Operations Strategies to Improve Travel Time ...

SHRP 2 L11: Final Appendices
San Antonio, Texas, Dynamic Message Signs (DMS) combined with incident management program resulted in a 2.8% reduction in
crashes (3).
Implementation of Closed Circuit TV (CCTV) and Service Patrols can reduce up to 20 minutes the incident response duration (4).
The Coordinated Highway Action Response Team in Maryland reduced incident duration and related secondary incidents by 29
percent in 2002, eliminating 377 crashes within its coverage area (5).
The expansion of the San Antonio TransGuide freeway management system had an estimated annualized crash reduction of 2.8% a
year (33).
• Mobility: In Georgia, the NaviGAtor incident management program reduced the average incident duration from 67 minutes to 21
minutes, saving 7.25 million vehicle-hours of delay over one year (1).
Traffic incident management programs have reported reductions in incident duration from 15 to 65 percent (5).
The Netherlands incident management program has achieved a 25% reduction in process time in 4 years (26).
On Toronto freeways, the COMPASS traffic management system saved 185 vehicles-hours of delay for every million vehicles
kilometers of travel (33).
The expansion of the San Antonio TransGuide freeway management system had an estimated annualized delay reduction of 5.7%
(33).
• Efficiency: An ambulance provider in Albuquerque, New Mexico increased its efficiency by 10 to 15 percent using AVL/CAD to
improve route guidance (1).
The HERO motorist assistance patrol program and NaviGAtor incident management activities in Georgia saved more than 187
million dollars yielding a benefit-to-cost ratio of 4.4:1 (2).
Incident Management Assistance Patrol (IMAP) program in Raleigh, North Carolina shows a 4.3: 1 b/c ratio (4).
• Energy/Environment: The NaviGAtor incident management program in Georgia reduced annual fuel consumption by 6.83 million
gallons, and contributed to decreased emissions: 2,457 tons less Carbon monoxide, 186 tons less hydrocarbons, and 262 tons less
Nitrous oxides (1).
A Simulation Study in Seattle showed that incident management system with traffic information system provided a fuel economy
improvement of 1.3 percent (3).
• Customer Satisfaction: Transportation Management Center staff in Pittsburgh indicated that a real-time traffic information system
used to monitor traffic density and congestion was useful and helped improve coverage for incident management (5).
ADDITIONAL DESCRIPTION AND QUANTITATIVE BENEFITS OF TRAVEL-TIME RELIABILITY STRATEGIES Page F-31