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Model Input. Dollar Value. Dollar value of time Accident costs Fuel costs Emission costs. Model Input. Equipment and Costs. Discount rate. Model Input. Equipment and Costs (Con’t). Equipment and unit costs for incident management, DMS, and HAR. Modeling Procedure. Overall Structure.
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Model Input • Dollar Value • Dollar value of time • Accident costs • Fuel costs • Emission costs 4-1
Model Input • Equipment and Costs • Discount rate 4-2
Model Input • Equipment and Costs (Con’t) • Equipment and unit costs for incident management, DMS, and HAR 4-3
Modeling Procedure • Overall Structure • Deployment • Performance measures and benefits • Costs • Benefit/Cost ratio 4-4
Example of Modeling Procedures • Travel Time • Loop over all the analysis periods • Calculate the traffic volume during the study period • Prepare the calculation of travel time on alternative route • Calculate incident delay and total time savings • Save the performance and benefits for each analysis period 4-5
Performance Measures and Benefits • Safety • Loop over all the analysis periods • Calculate number of fatalities, injuries, PDO • Calculate accident costs • Save the performance and benefits for each analysis period 4-6
Performance Measures and Benefits • Fuel Consumption • Loop over all the analysis periods • Calculate vehicle miles in queue and fuel consumption in queue • Calculate fuel savings • Save the performance and benefits for each analysis period 4-7
Model Output • Summary of Performance • Incident delay in vehicle-hour • Number of accidents • Fuel consumption in gallons 4-8
Model Output • Summary of Performance (Con’t) • Emissions in grams • Number of road ranger activities 4-9
Model Output • Summary of Annual Benefits for Each Period 4-10
Model Output • Summary of Benefits and Costs 4-11
Assessment Elements • Performance modules (emission, fuel consumption, safety, TT) • ITS impacts • ITS costs • Dollar values of benefits
Time-of-Day • Analysis can be conducted using Daily and Time-of-Day Model • The benefits for each analysis time period calculated separately and summed to produce the total • For peak period models, modules are applied to each period module and the benefits are summed. • For daily models, period-specific multiplication factors utilized to convert the daily link volume to analysis period volumes • default factors derived on data from Broward County state roads.
Performance Measures • Vehicle miles of travel (VMT); • Vehicle hours of travel (VHT); • Average speed; • Number of accidents • Fatality • Injury • Property damage only • Fuel Consumption (gallons) • Monetary benefits to users and/or agency, as appropriate • Emission (gm) • Hydrocarbon • Carbon monoxide • Oxides of Nitrogen
Benefit Evaluation Methods • A method developed for each component • Review and assessment of methods used in evaluation tools • Review of literature • Default ITS impact parameters derived based on a review of previous evaluation studies, USDOT benefit database and the values used in existing ITS sketch planning tools. • The user will be able to change the default ITS impact parameters and perform sensitivity analysis.
ITS Cost • The cost information include the number and types of equipment required for each type of evaluated ITS deployment • The cost information include initial cost, operation and maintenance cost, estimated interest rate, and life time of each equipment • Based on information from ITS agencies collected in a previous FDOT effort and information collected in this study • User can change the defaults and is encouraged to do this based on projects at hand
Dollar Values • Travel Time value is 13.45 dollars per person-hour. For commercial vehicles $71.0 per hour based on TTI study. • $3,200,000 per fatal crash, $74,730 per injury crash, and $3,000 per PDO crash • Fuel Consumption $3 per Gallon • Emission using IDAS defaults -$1,774, $3,731, and $3,889 per gallon, for the HC, NOx, and CO pollutants.
Air Pollution Dollar Values • IDAS does not mention the source of the dollar values • Pollution impacts human health and causes ecological and esthetic degradations • Review indicates that IDAS values could be conservative estimates. Thus, they were used in this study.
ITS impact parameters • Default ITS impact parameters derived based on a review of previous evaluation studies, US DOT JPO benefit database and the values used in existing ITS sketch planning tools. • The user will be able to change the default ITS impact parameters and do sensitivity analysis.
Safety Module • IDAS model modified for Florida conditions • v/c versus PDO, injury, and fatality crash rate per MVM
