Post on 18-Jan-2016
description
4-1
Model Input
Dollar Value
Dollar value of time Accident costs Fuel costs Emission costs
4-2
Model Input Equipment and Costs
Discount rate
4-3
Model Input Equipment and Costs (Con’t)
Equipment and unit costs for incident management, DMS, and HAR
4-4
Modeling Procedure
Deployment Performance measures and
benefits Costs Benefit/Cost ratio
Overall Structure
4-5
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
Example of Modeling Procedures
4-6
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
Performance Measures and Benefits
4-7
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
Performance Measures and Benefits
4-8
Model Output Summary of Performance
Incident delay in vehicle-hour
Number of accidents Fuel consumption in
gallons
4-9
Model Output Summary of Performance (Con’t)
Emissions in grams Number of road
ranger activities
4-10
Model Output
Summary of Annual Benefits for Each Period
4-11
Model Output Summary of Benefits and Costs
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.
Fuel Consumption (Freeways)
Fuel Consumption (Arterials)
Emission Module (CO 2000)
Emission Module (CO 2030)
Comparision of CO emissions in 2030
0
10
20
30
40
50
60
70
80
0 10 20 30 40 50 60 70
Speed (mph)
Em
issi
on
Rat
e(G
ram
s p
er M
ile) Florida
Southeast Florida
IDAS-Mobile5a
IDAS-Emfac
Scrits
Safety Module
IDAS model modified for Florida conditions v/c versus PDO, injury, and fatality
crash rate per MVM
V/C Fatality
Injury PDO
Freeway Auto Arterial AutoFreeway
TruckArterial Truck
Freeway Auto
Arterial AutoFreeway
TruckArterial Truck
0.09
A constant of 0.0004
for freeways
and0.0072 for arterials.
0.5156 1.715 0.5156 1.715 0.8551 2.394 0.8551 2.394
0.19 0.5156 1.715 0.5156 1.715 0.8551 2.394 0.8551 2.394
0.29 0.5156 1.715 0.5156 1.715 0.8551 2.394 0.8551 2.394
0.39 0.5156 1.715 0.5156 1.715 0.8551 2.394 0.8551 2.394
0.49 0.5156 1.715 0.5156 1.715 0.8551 2.394 0.8551 2.394
0.59 0.5757 1.715 0.5757 1.715 0.8551 2.394 0.8551 2.394
0.69 0.5757 1.715 0.5757 1.715 0.8551 2.394 0.8551 2.394
0.79 0.5757 1.715 0.5757 1.715 0.9953 2.394 0.9953 2.394
0.89 0.5757 1.715 0.5757 1.715 0.9953 2.394 0.9953 2.394
0.99 0.7329 1.715 0.7329 1.715 1.1591 2.394 1.1591 2.394
1.00 0.7329 1.715 0.7642 1.715 1.2737 2.394 1.2737 2.394
Case Study
Case Study Results
DMS Benefits
Peak PeriodIDAS Method Implemented in FSUTMS
Enhanced Method Implemented in FSUTMS
AM Peak Period $1,010,503 $1,511,443
PM Peak Period $1,552,072 $3,664,827
Off-Peak Period $5,246,229 $1,105,612
Total $7,808,804 $6,281,882