Evaluating Alternative Operations Strategies to Improve Travel Time ...

SHRP 2 L11: Final Appendices
Table F.1 (Continued) Key Quantitative Benefits for Operational Strategies (Categories 4
and 5)
4.0 Incident and Special Event Management
4.1 Pre-event Service Patrols
4.2 Post-event
On-Scene Incident Management
Work Zone Management
5.0 Infrastructure Improvements and Demand Optimization
5.1 Geometric Design
Treatments
5.2 Access Management
5.3 Signal Timing/ ITS
5.4 Traffic Demand
Metering
5.5 Variable Speed
Limits
Bottleneck Removal (Weaving,
Alignment)
Geometric Improvements (Interchanges,
Ramps, Intersections, Narrow Lanes,
Temporary Shoulder Use)
Access Management (Driveway location,
Raised medians, channelization, frontage
road)
Transportation Management Center
(TMC)
Signal Retiming/ Optimization
Traffic Signal Preemption at Grade
Crossings
Traffic Adaptive Signal Control/
Advanced Signal Systems
Advanced Transportation Automation
Systems, Signal Priority and AVL
Ramp Metering, Ramp Closure
5.6 Congestion Pricing Electronic Toll Collection (ETC)
5.7 Lane Treatments
Can reduce incident response time by 19% to 77%
and incident clearance time by 8 minutes (4)
Traffic incident management programs have
reported reductions in incident duration from 15%
to 65% (5, 26)
Reduces work zone related delays by 50% to 55%
(1, 2)
Reduces travel time by 5% to 15% (23,52)
Geometric improvements increase overall capacity
by 7% to 22% (25)
Unknown benefit towards reducing
congestion.
Reduces delay by 10% to 50% (12, 32)
Traffic signal retiming programs result in travel
time and delay reductions of 5% to 20% (20)
Simulation models show that delays at grade
crossings can be reduced by up to 8% (17)
Adaptive signal control systems have been shown
to reduce peak period travel times 6% to 53% (1)
Reduces transit delays by 12% to 21% (1,3)
A study regarding the use of ramp meters in North
America found that the mainline peak period flows
increased 2% to 14% due to on-ramp metering (51.
Variable Speed Limits (VSL) Increases throughput by 3% to 5% (25)
Cordon Pricing (Area wide)
Managed Lanes: High-Occupancy
Vehicles (HOV ) lanes, High-occupancy
Toll (HOT) lanes, Truck-only Toll
(TOT) lanes
Changeable Lane Assignments
(Reversible, Variable)
Electronic Toll Collection (ETC) reduces delay by
50% for manual cash customers and by 55% for
automatic coin machine customers, and increases
speed by 57% in the express lanes (1)
Congestion pricing in London decreased inner city
traffic by about 20% (1)
Provides reduction in travel times up to 16% (25)
Unknown benefit towards reducing congestion
5.8 Multimodal Travel Integrated Multimodal Corridors (IMC) Unknown benefit towards reducing congestion
5.9 Travel Reduction
Travel Alternatives (Ride Share
Programs, Telecommuting, Home office,
Video conferences)
Unknown benefit towards reducing congestion
ADDITIONAL DESCRIPTION AND QUANTITATIVE BENEFITS OF TRAVEL-TIME RELIABILITY STRATEGIES Page F-18