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