Evaluating Alternative Operations Strategies to Improve Travel Time ...

SHRP 2 L11: Final Appendices
• Energy/Environment: Congestion charging in London led to reductions in emissions of 8 percent in oxides of nitrogen, 7 percent in
air born particulate matter, and 16 percent in carbon dioxide when compared to data from 2002 and 2003 prior to the introduction
of congestion charging (5).
• Customer Satisfaction: In May 2003, members of the London First business group were surveyed, a group of approximately 500
business. The results indicated that 69 percent of respondents felt that congestion charging had no impact on their business, 22
percent reported positive impacts on their business, and 9 percent reported an overall negative impact. Many industries supported
the charge because its direct costs were offset by savings and benefits, such as faster delivery times (1).
Strategy: 5.7. Lane Treatments
Category: 5. Infrastructure Improvements and Optimization
TREATMENTS AND IMPACTS:
Managed Lanes: High-Occupancy Vehicles (HOV) lanes, High-occupancy Toll (HOT) lanes, truck only lanes, Truck-only Toll
(TOT) lanes, HOV By-Pass Ramp
• Safety: A study by the Texas Transportation Institute (TTI) suggested that HOV lanes increased the number of auto accidents,
either in the lane or in adjacent regular lanes. In Dallas, accidents involving injury have increased by 56% in HOV zones since they
were built in the 1990s (22).
• Mobility: A study show that the implementation of Super HOT concept (freeway pricing strategy and managed lanes system) in
the Los Angeles, CA and Atlanta, VA areas would reduce peak period congestion delay by up to 33h and 28h per traveler annually
(7).
A Study for Houston HOV lanes showed that the average daily directional peak period savings ranged from around $8,300 to over
$50,000 per corridor. The Katy Freeway HOV lane produced the most savings in both the AM and PM peak periods, with
approximately $81,000 per day in savings. The Southwest Freeway HOV lane had the least amount of savings during both the AM
and PM peak periods, averaging around $18,000 per day. The research estimates that the HOV lane savings for the four freeways
combined exceeds $149,000 per day, resulting in almost $38 million per year in travel time savings (21).
HOV lanes on M606-M62 HOV gate in the U.K. has provide approximately 16% reduction in travel times (25).
• Efficiency: A study show that the implementation of Super HOT concept (freeway pricing strategy) in the Los Angeles, CA and
Atlanta, VA areas would save each traveler by up to 83 and 70 gal of fuel annually (7).
ADDITIONAL DESCRIPTION AND QUANTITATIVE BENEFITS OF TRAVEL-TIME RELIABILITY STRATEGIES Page F-44