Evaluating Alternative Operations Strategies to Improve Travel Time ...

SHRP 2 L11: Final Appendices
Summary of Strategy Quantitative Benefits
The impacts of the application of the strategies and treatments are described in this Appendix in
terms of the anticipated travel time savings. Quantitative benefits (in terms of travel time savings
or delay reduction) have not been determined for Category 1 – Institutional Strategies. However,
quantitative benefits have been determined for the 18 strategies in Categories 2 – 5. Table F.1
quantifies information related to travel time reliability improvements and congestion reduction.
Table F.1 - Key Quantitative Benefits for Operational Strategies (Categories 2 - 3)
Strategy Treatments Key Quantitative Benefits
2.0 Information Collection and Dissemination
Remote Verification (CCTV)
2.1 Surveillance and Detection Driver Qualification
Automated Enforcement
5% reduction in travel times in non-recurring
congestion and overall 18% reduction in travel
times (3, 11).
Reduces non-recurring congestion by reducing
accidents (55)
Reduces travel time (60,61 )and improves safety
(56, 57, 58)
2.2 Probe Vehicles and Point
Detection
GPS, Video Detection, Microwave
Radar, Bluetooth MAC Readers
No direct benefit to reducing congestion, but
essential to providing reliable real-time information
2.3 Pre-trip Information
National Traffic and Road Closure
Information
Reduces delays (early and late arrivals) by 50% (5)
Planned Special Events Management Reduces delay due to special events (20)
2.4 Real-time Information
2.5 Roadside Messages
3.0 Vehicle Technologies
3.1 Vehicle Infrastructure
Integration
3.2 Driver Assistance Products
Pre-trip information by 511, web sites,
subscription alerts, radio
Road Weather Information Systems
(RWIS)
Freight Shipper Congestion
Information/Commercial Vehicle
Operations (CVO), Load Matching
Systems/ Terminals and port gates
Travel Time Message Signs for Travelers
(DMS & VMS)
Vehicle Infrastructure Integration (VII)
Electronic Stability Control; Obstacle
Detection Systems; Lane Departure
Warning Systems; Road Departure
Warning Systems
Potential reduction in travel time from 5% to 20%
(1)
Reduces delay by up to 12% (3, 4)
Reduces freight travel time by up to 10% (1, 3, 4),
Using access technology and appointments at port
gates could increase by vehicle productivity by 10
to 24% (Namboothiri Cite)
Improves trip time reliability with delay reductions
ranging from 1% to 22% (1, 5, 6)
Unknown benefit towards reducing congestion
Reduces accidents involving vehicles by up to 50%
(32) and reduces travel times by 4% to 10% (1)
ADDITIONAL DESCRIPTION AND QUANTITATIVE BENEFITS OF TRAVEL-TIME RELIABILITY STRATEGIES Page F-17