Evaluating Alternative Operations Strategies to Improve Travel Time ...

SHRP 2 L11: Final Appendices
• Energy/Environment: A study conducted by NCTCOG estimated that the volatile organic compound (VOC) emissions are reduced
by 23.4 kg/day on I-30, 50.0 kg/day on I-35E North, and 107.6 kg/day on I-635 due to the HOV lanes on each of these facilities
(60).
• Customer Satisfaction: Research conducted by PA Consulting Group and University of Liverpool showed that 82% of people
questioned support the use of speed and red-light cameras (57).
Research regarding automated speed enforcement in Montgomery County, Maryland indicated that 74% of Montgomery County
drivers thought speeding on residential streets was a problem and 62% supported the automated speed enforcement (58).
Strategy: 2.2. Probe Vehicles and Point Detection
Category: 2. Information Collection and Dissemination
TREATMENTS AND IMPACTS:
GPS, Video Detection, Microwave Radar, Transponders, Bluetooth MAC Readers
• Safety: Speed camera programs can reduce crashes by 9 to 51% (1).
• A 2007 NHTSA literature review documented studies of speed camera programs worldwide, which reported crash reductions from
9 to 41 percent (5).
• A study of 2 years of crash data following deployment of speed cameras at study sites throughout the U.K. found a 35 percent
reduction in the number of people killed or seriously injured at camera locations and 14 percent decline in the number of personal
injury crashes (5).
• Mobility: A simulation experiment in one segment of Baltimore-Washington Parkway in Maryland showed the ad hoc networks
can provide accurate information regarding vehicle's travel time (8).
• Efficiency: In Montana, weigh-in-motion (WIM) sensors were installed directly in freeway travel lanes to continuously collect
truck weight and classification data at 28 sites. The study found that if freeway pavement designs were based on fatigue
calculations derived from comprehensive WIM data instead of weigh station data, the State would save about $4.1 million each
year in construction costs (5).
• Customer Satisfaction: Fifteen (15) months after extensive deployment of automated speed enforcement cameras in the United
Kingdom, a nationwide survey found 70 percent of those surveyed thought that well placed cameras were a useful way of reducing
crashes and saving lives, while 21 percent thought that speed cameras were an infringement of civil liberties.101 Public opinion
surveys indicated 60 to 80 percent support for red light enforcement camera programs (15).
ADDITIONAL DESCRIPTION AND QUANTITATIVE BENEFITS OF TRAVEL-TIME RELIABILITY STRATEGIES Page F-21