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Arterial Management
SafetySpeed camera programs can reduce crashes by 9 to 51%.
MobilityField studies in several cities have shown that adaptive signal control systems can reduce peak period travel times 6-53%.
ProductivityBenefit-to-cost ratios for traffic signal optimization range from 17:1 to 175:1. 
EfficiencyAdaptive signal control integrated with freeway ramp meters in Glasgow, Scotland increased vehicle throughput 20% on arterials and 6% on freeways.
Energy & EnvironmentSignal retiming projects in several U.S. and Canadian cities reduced fuel consumption by 2 to 9%.
Customer SatisfactionSurvey data collected from an organization of approximately 500 businesses in London indicated that 69% of respondents felt that congestion charging had no impact on their business, 22% reported positive impacts on their business, and 9% reported an overall negative impact.
Freeway Management
SafetyA survey of traffic management centers in eight cities found that ramp metering reduced the accident rate by 24-50%.
MobilityIn Salt Lake Valley, Utah a ramp metering study showed that with an 8 second metering cycle, mainline peak period delay decreased by 36 percent, or 54 seconds per vehicle.
ProductivityA study found that the benefit-to-cost ratio of the Minneapolis-St. Paul ramp metering system was 15:1. 
EfficiencyAfter ramp meters were experimentally turned off in the Twin Cities, MN, freeway volume declined 9% and peak period throughput decreased 14%.
Energy & EnvironmentA simulation study in Minneapolis-St. Paul estimated that ramp metering saved 2 to 55% of the fuel expended at each ramp.
Customer SatisfactionIn Houston, 85% of motorists surveyed changed their route after viewing real-time travel time information on freeway dynamic message signs.
Crash Prevention & Safety
SafetyIn Myrtle Creek, Oregon an advanced curve speed warning system installed on I-5 reduced the speed of 76% of drivers surveyed.
MobilityModels of increased traffic flow at a San Antonio rail crossing showed dynamic message signs with delay information can reduce system delay 6.7%.
Productivitynot available
Efficiencynot available
Energy & EnvironmentAn automated horn warning system in Ames, Iowa, reduced elevated noise impact areas 97% adjacent to a highway rail intersection.
Customer SatisfactionIn Los Angeles, 93% of the survey respondents believed that the "second train coming" warning signs improved the safety at the light rail transit grade crossing.
Road Weather Management
SafetyIn North Carolina, a wet pavement detection system on I-85 yielded a 39% reduction in the annual crash rate under wet conditions.
MobilitySignal timing plans implemented in Minnesota to accommodate adverse winter weather resulted in an 8% reduction in delay.
ProductivityIn Salt Lake City, Utah, staff meteorologists stationed at a TOC provided detailed weather forecast data to winter maintenance personnel, reducing costs for snow and ice control activities, and yielding a b/c ratio of 10:1.
Efficiencynot available
Energy & EnvironmentEvaluation data show that anti-icing and pre-wetting strategies can reduce sanding applications by 20% to 30%, decrease chemical applications by 10%, and reduce chloride and sediment runoff in local waterways.
Customer SatisfactionIn Idaho, 80% of motorists surveyed who used Road-Weather Integrated Data System information as a traveler information resource indicated that the information they received made them better prepared for adverse weather.
Roadway Operations & Maintenance
SafetyIn Nebraska, a portable speed detection and warning system placed upstream from an I-80 work zone decreased the highest 15% of vehicle speeds by about 5 mi/hr as vehicles approached the work zone lane merge area.
MobilityIn North Carolina, a modeling study indicated that work zone delay messages reduced maximum traffic backups by 56% and contributed to 55% reduction in traveler delay.
ProductivityA Kansas DOT survey of transportation agencies found that AVL applications for highway maintenance can have b/c ratios ranging from 2.6:1 to 24:1.
EfficiencyModeling data indicated that an automated work zone information system deployed on I-5 near Los Angeles contributed to a 4.3% increase in diversions and an 81% increase in average network speed.
Energy & Environmentnot available
Customer SatisfactionIn North Carolina, a survey of local residents near Smart Work Zone systems found that over 95% would support use of these systems in the future.
Transit Management
Safetynot available
MobilityTransit signal priority systems improved bus travel times 1-42%.
ProductivityAn evaluation of scheduling software for the paratransit service in Billings, Montana found that the break-even point for savings as a result of the software implementation was a 3% improvement in efficiency.
EfficiencyIn Portland, OR, models of transit data showed AVL/CAD may allow same level-of-service to more travelers using the same rolling stock.
Energy & EnvironmentSimulation of a transit signal priority system in Helsinki, Finland indicated that fuel consumption decreased by 3.6%, Nitrogen oxides were reduced by 4.9%, Carbon monoxide decreased by 1.8%, hydrocarbons declined by 1.2%, and particulate matter decreased by 1.0%.
Customer SatisfactionSurveys found that riders on Vancouver's 98 B-line Bus Rapid Transit (BRT) service, which implemented transit signal priority to improve schedule reliability, rated the service highly with regard to on-time performance and service reliability (an average of 8 points on a 10 point scale).
Transportation Management Centers
Safetynot available
Mobilitynot available
Productivitynot available
EfficiencyIn the Minneapolis/St. Paul, traffic speed data collected at two interstate work zones showed that when portable traffic management systems were deployed, work zone traffic volumes increased 4% to 7% during peak periods.
Energy & Environmentnot available
Customer SatisfactionTMC staff in Pittsburgh, Pennsylvania found real-time traffic information useful and noted that it improved coverage for incident management.
Traffic Incident Management
SafetyThe Maryland State CHART highway incident management system facilitated a 28.6% reduction on the average incident duration leading to an estimated 377 fewer secondary incidents.
MobilityIn 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.
ProductivityIn 2004, a survey was conducted by the University of California, Berkeley, which found that the benefits of the Los Angeles Metro Freeway Service Patrols outweighed the costs by more than 8 to 1.
Efficiencynot available
Energy & EnvironmentIn Georgia, the NaviGAtor incident management program 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.
Customer SatisfactionIn Atlanta, satisfaction with motorist assistance patrols ranged from 93% to greater than 95% in two surveys of drivers already aware of the service.
Emergency Management
SafetyHAZMAT safety and security technologies can reduce the potential for terrorist consequences by approximately 36%.
MobilityIn Hampton Roads, Virginia, a hurricane evacuation plan indicated that lane reversal is warranted for any hurricane predicted to make landfall as a Category 4 or 5 storm, and is strongly recommended for any Category 3 storm.
ProductivityHAZMAT safety and security technologies can have tremendous societal cost savings well beyond the break even point for benefits and costs.
EfficiencyFreeway lane reversal improved traffic volumes by 44% following South Carolina hurricane.
Energy & Environmentnot available
Customer SatisfactionSurvey responses from key professionals in five states indicate the following ITS technologies have the highest potential to benefit emergency transportation operations: interoperable radio communications, dynamic message signs, GPS and geographical information systems, closed circuit television roadway surveillance, and Enhanced 911.
Electronic Payment & Pricing
SafetyIn Florida, the addition of Open Road Tolling to an existing Electronic Toll Collection mainline toll plaza decreased crashes by an estimated 22% to 26%.
MobilityIn Florida, the addition of Open Road Tolling (ORT) to an existing Electronic Toll Collection (ETC) mainline toll plaza decreased delay by 50% for manual cash customers and by 55% for automatic coin machine customers, and increased speed by 57% in the express lanes.
ProductivityTraditional resource-based estimates of benefits and costs in London produced b/c ratios of 2.0:1 with the £5 charge and 2.5:1 with the £8 charge.
EfficiencyFor toll facilities, average travel time savings ranged from 13 to 55 seconds per transaction, with a simple unweighted average of 30 seconds time savings, valued at $0.59 per event.
Energy & EnvironmentAn evaluation of electronic toll collection systems at three major toll plazas outside Baltimore, Maryland indicated these systems reduced environmentally harmful emissions by 16% to 63%.
Customer SatisfactionIn California, public support for variable tolling on SR91 was initially low, but after 18 months of operations; nearly 75% of the commuting public expressed approval of virtually all aspects of the Express Lanes program.
Traveler Information
SafetyIDAS models of ARTIMIS in Cincinnati and Northern Kentucky estimated traveler information reduced fatalities 3.2%.
MobilityIn the Washington DC metropolitan area, drivers who use route-specific travel time information instead of wide-area traffic advisories can improve on-time performance by 5% to 13%.
ProductivityIn the DC area, models showed pre-trip departure notification can reduce early/late arrivals and save 40% of users $60 or more each year in lost time.
EfficiencyModeling studies in Detroit, Seattle, and Washington, DC have shown slight improvements in corridor capacity with provision of traveler information.
Energy & EnvironmentA simulation study indicated that integrating traveler information with traffic and incident management systems in Seattle, Washington could reduce emissions by 1% to 3%, lower fuel consumption by 0.8%, and improve fuel economy by 1.3%.
Customer SatisfactionCustomer satisfaction with 511 ranged from 68% to 94% in four deployments studied.
Information Management
Safetynot available
Mobilitynot available
ProductivityA study evaluating data archiving at more than 60 organizations found that data warehousing generated an average return on investment of 401% over 3 years.
EfficiencyIn Portland, Oregon, the Tri-Met transit agency used archived AVL data to reduce variation in run times by 18% and improve schedule efficiency by 9%.
Energy & Environmentnot available
Customer Satisfactionnot available
Commercial Vehicle Operations
SafetyHAZMAT safety and security technologies can reduce the potential for terrorist consequences by approximately 36%.
MobilityIn Colorado, an automated commercial vehicle pre-screening system installed at three ports of entry check stations saved approximately 8,000 vehicle hours of delay per month.
ProductivityApproximately 50% of Commercial Vehicle Information Systems and Networks (CVISN) managers surveyed indicated that CVISN electronic credentialing systems can save staff time and labor, allowing additional support to be assigned to more critical agency functions.
EfficiencyPre-clearance systems that use interagency coordination to deploy interoperable electronic toll collection (ETC) and electronic screening (E-screening) systems can save carriers between $0.63 and $2.15 per event at weigh stations.
Energy & EnvironmentIn Colorado, an automated commercial vehicle pre-screening system installed at 3 ports of entry check stations saved 48,200 gallons of fuel per month.
Customer SatisfactionGreater than 50% of highway maintenance users said they wanted to continue using FORETELL, a multi-state weather information network,in the future, and about 20% said they would pay for the service.
Intermodal Freight
Safetynot available
MobilityA modeling study found that an appointment system for scheduling truck arrivals at cargo transfer facilities could reduce truck's in-terminal time by 48%.
ProductivityEvaluation data collected from the Freight Information Real-time System (FIRST) for Transport project estimated that savings per drayage trip to an ocean terminal would range from $21.36 to $247.57.
EfficiencyWith potential cost saving benefits ranging from $11.77 to $16.20 per air-freight shipment, Electronic Supply Chain Manifest could save the freight industry more than $2 billion per year.
Energy & EnvironmentIn Chicago, a feasibility study indicated that automated truck-way technologies (automatic truck steering, speed, and platoon spacing control) would save travel time and reduce fuel consumption.
Customer SatisfactionCarriers surveyed indicated they were very satisfied with the ability of electronic supply chain manifest systems to duplicate paper-based systems.
Intelligent Vehicles
SafetyBased on all police-reported crashes in 7 states over 2 years, electronic stability control reduced single-vehicle crash involvement risk by approximately 41% and single-vehicle injury crash involvement risk by 41%.
MobilityModeling performed as part of an evaluation of 9 ITS implementation projects in San Antonio, Texas indicated that drivers of vehicles with in-vehicle navigation devices could experience an 8.1% reduction in delay.
ProductivityThe combined benefit-cost analysis showed positive b/c ratios in all categories, from a low of 1:1 in the less than truckload environment to a high of 97:1 in the truckload explosives operations.
EfficiencyIn Erie County, New York, a field operational test found that automated collision notification systems reduced incident notification time from an average of 3 minutes to less than 1 minute.
Energy & EnvironmentIn Torino, Italy, a simulation study found that an automated speed control system designed to optimize travel speeds between green lights can reduce fuel consumption by 8.3% to 13.8%, reduce CO2 emissions by 3.9% to 5.4%; reduce hydrocarbon emissions by 4.2% to 6.9%, and reduce NOx emissions by 7.9% to 11.3%.
Customer SatisfactionTwo surveys asked motor carriers what the motivation was for safety technology installation. A clear majority of the respondents indicated that crash reduction (68%) and lower insurance rates (52%) were key benefits.