National VMT Development Procedure
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Transcript of National VMT Development Procedure
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National VMT Development Procedure
Highway Information SeminarOctober 22 - 25, 2012Patrick Zhang, [email protected] , 202-366-1941Office of Highway Policy Information, FHWA
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Objective
To illustrate how national vehicle miles travelled data are developed and the criticalness of State submitted data
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What National VMT Is About
The National VMT data has four key components: VMT by roadway functional class and vehicle type National registered vehicles by six vehicle types, National total fuel consumed Fuel efficiency - MPG for each of the six vehicle groups
National VMT data are often referred to as VM-1 data because the table has all the information is named VM-1.
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VM-1
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Data Sources
1. VMT: Highway Performance Monitoring System (HPMS) from States
2. Registered Vehicles – from States
3. Fuel consumption - from States
4. Fuel efficiency – Modeling
5.
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VMT
1. HPMS Statewide Summaries for rural collectors and locals.
2. HPMS Urban Summaries3. AADT x length
VM-2 table:VMT by 14 roadway types and by states
+ VM-4 table:Vehicle Summary Data by 6 vehicle types and
6 roadway types
Merger roadway
types
VMTBy 6 roadway
types and by 6 vehicle types
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Vehicle Miles Travelled by Roadway Types Data Sources
1: HPMS Statewide Summaries – daily VMT for rural minor collectors, rural locals, and small urban locals
2: HPMS Urban Area Summaries – urban local daily VMT
3: All Others – AADT x length of roadway segment
State total = 1 + 2 + 3
VM-2 table
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Sample VM-2 (portion)
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VM-4 Table
• VM-4 Table is created using Vehicle Summary Data
• Vehicle Summary Data contains 6 Vehicle Types and 6 Roadway types
• Vehicle Summary Data are in the format of Percentages on each of 6 roadway types
• Total of percentages on each roadway is 100%
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A Sample Vehicle Summary Data
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Roadway Types Merges
VM-4 VM-2Interstate (1) InterstateOther Arterial (2) PA - Other Freeways +
(3) PA – Other + (4) Minor Arterial
Other Urban (rural) (5) Major Collector + (6) Minor Collector + (7) Local
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VMT by Vehicle Calculations
Vehicle VMT (on a roadway)
= % (on a roadway) * VMT (of a roadway)
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How to Calculate Vehicle VMT• Vehicle VMT (roadtype) = Veh% x VMT (roadtype) Veh% is the Vehicle Summary Data• Example:
• A stable Veh% is essential to produce stable Vehicle VMTs
16941 Rural Interstate VMT
X times the percentages
MotorCyclePassenger
Car Light Truck Bus Single UnitCombination
Truck Total0.49% 62.82% 19.50% 0.21% 3.90% 13.08% 100.00%
Rural Interstate VMT by Vehicle Types83.0 10642.3 3303.5 35.6 660.7 2215.9 16941
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Vehicles
• # of vehicle is imported from MV-1 table (include Motorcycles)
• 4 Vehicle types are split using Polk data (Light Duty Vehicle short wheel and long wheel base, Single Unit Truck, Combination Truck)
• VMT per vehicle is calculated• Fuel consumed per vehicle is calculated
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New VM-1 Vehicle classification
• Light Duty Vehicle Short WB:wheelbases <= 121 inches.
• Light Duty Vehicle Long WB:wheelbases > 121 inches.
• Most of car, van, small SVU, mini pickups belong to Light Duty Vehicle Short WB
• Large passenger car (0.7%), vans (21.0%), pickup trucks (83.4%), and sport/utility vehicles (8.5%) belong to Light Duty Vehicle Long WB in 2008.
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Fuel Consumption
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Fuel Efficiency
• Vehicle Stock Model to approximately estimate MPG by vehicle types
• Optimization tech to finalize the MPGtotal fuel = total fuel consumed
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Stock ModelThe vehicle stock model can be expressed mathematically as:
yy
yfy
y yfyf
MPGPopVMTPopVMT
MPGVeh _
ftypefuelandyyearmodelforoperationincarsofnumberPop
ftypefuelandyyearmodelforMPGfleetcarMPG
yyearmodelforvehicleperVMTaverageannualVMT
yf
yf
y
Where
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MPG Model
2
1
12
tvf
tvf
VSvf
VSvf
v f MPGMPG
MPGMPG
Minimizetvf
tvf MPGMPG
tf
htvhf
vFuelTotal
VMTtoSubject
tvfMPG
:
ftypefuelfornconsumptiofueltotalyearcurrentFuelTotal
ftypefuelandvvehicleforMPGmodelstockvehicleMPG
ftypefuelandvvehicleforMPGyearpreviousMGT
ftypefuelandvvehicleforMPGyearcurrent
ftypefuelandhclasshighwayvtypevehicleforVMTyearcurrentVMT
tf
VSvf
tvf
tvhf
1
tvfMPG
Where
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ReferencesAnnual Vehicle Miles Travelled and Related Data -- Procedures Used to Derive Data Elements Contained in Highway Statistics Table VM-1 for Years 2009 and after and 2007 and 2008 Historical Data http://www.fhwa.dot.gov/ohim/vm1_methodology_2007.pdf
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Questions?