Transcript Document
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 Timeof-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
80
Emission Rate
(Grams per Mile)
70
60
Florida
50
Southeast Florida
40
IDAS-Mobile5a
IDAS-Emfac
30
Scrits
20
10
0
0
10
20
30
40
Speed (mph)
50
60
70
Safety Module
IDAS model modified for Florida
conditions
v/c versus PDO, injury, and fatality
crash rate per MVM
Injury
V/C
Fatality
PDO
Freeway Auto
Arterial Auto
Freeway
Truck
Arterial Truck
Freeway
Auto
Arterial Auto
Freeway
Truck
0.09
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
0.5156
1.715
0.5156
1.715
0.8551
2.394
0.8551
2.394
0.5156
1.715
0.5156
1.715
0.8551
2.394
0.8551
2.394
0.5757
1.715
0.5757
1.715
0.8551
2.394
0.8551
2.394
0.5757
1.715
0.5757
1.715
0.8551
2.394
0.8551
2.394
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
0.39
0.49
0.59
0.69
0.79
A constant
of 0.0004
for
freeways
and
0.0072 for
arterials.
Arterial Truck
Case Study
Case Study Results
DMS Benefits
IDAS 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
Peak Period