Fehr & Peers

Begin by entering the geographic area where your project is located. Enter in either land use quantities (number of dwelling units or 1,000 square feet of non-residential uses) or daily trip generation for residential, retail, office, industrial, school, or other uses. Land use quantities are converted to daily trips using Institute of Transportation Engineers Trip Generation, 8th Edition data. Users can specify the average, linear, or logarithmic trip generation rate. The user can also manually enter daily trip generation for the different categories if the standard ITE categories are not applicable.

Select Geographic Area

Land Use Type		Units	Method	Daily Trips
Number of Dwelling Units
	Single Family (ITE 210)
	Multi-Family (ITE 220)
	High Rise Condo (ITE 232)
	Other Residential
Retail Floor Space (ksf)
	General Retail other than those listed below (ITE 820)
	Supermarket (ITE 850)
	Bank (ITE 912)
	Health Club (ITE 492)
	Restaurant (non-fast food - ITE 932)
	Fast-Food Restaurant (ITE 934)
	Gas Station (ITE 945)
	Auto Repair (ITE 942)
	Other Retail
Office Floor Space (ksf)
	Non-Medical (ITE 710)
	Medical (ITE 720)
	Other Office
Industrial Floor Space (ksf)
	Light Industrial (ITE 110)
	Manufacturing (ITE 140)
	Warehousing (ITE 150)
	Other Industrial
Hotel rooms (ITE 310)
Movie Screens (ITE 445)
School Enrollment
	Grade School (ITE 520)
	High School (ITE 530)
	College (ITE 550)
Misc Floor Space (ksf) not covered above

Total ITE Trips Generated
Total HH Trips Generated
Total Retail Trips Generated
Total Office Trips Generated
Total Industrial Trips Generated
Total School Trips Generated
Total Other Trips Generated

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This section reduces the total gross trip generation from the previous section by accoiunting for internal trips. Internal trips are the trips that remain within a mixed-use development that would otherwise drive off from the project site. For for simple or single use sites, the level of internalization is minimal and this step can be ignored. Accurate internal trip estimates will reduce the potential for over-estimating a project's VMT and GHG emissions. Some potential sources for internalization estimates can be obtained from a regional travel model, FHWA HPMS data, or using tools like Fehr & Peers 5D MXD trip generation tool.

Trip Purpose	Internalization Percentage	Description
Home to work trips	%	This is the percentage of onsite residential work trips that go to jobs within the project. For small projects, this percentage will tend to be small. For large projects, this percentage can be fairly large.
Home to other (shopping, services, recreation) trips	%	This is the percentage of onsite residential non-work (shopping, dining, recreation) trips that remain within the project area.
Home to school trips	%	This is the percentage of school trips (student drop-off, student drivers) that remain onsite between project homes and schools. For large sites, many of the school trips could remain internal to the project area.
Trips between non-home uses	%	This is the percentage of non-home-based trips that remain onsite. Examples of non-home-based trips include trips from work to lunch, or trips between two retail uses. In this case, only trips between onsite retail and employment are considered.

Reasonableness Checks	Trips	Percentage
Total Home-to-Work Reduction
Total Home-to-Other Reduction
Total Home-to-School Reduction
Total Non-Home Trip Reduction
Total Overall Trip Internalization

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Based on the results from the previous steps, VMT is calculated below. This step contains default values from the Puget Sound region for trip purpose splits and average trip length by trip purpose. Adjust the purpose splits and trip lengths as appropriate for a given project. It is important to estimate the average internal trip length (for internal project/plan vehicle trips) since this will vary significantly by project. Some reasonableness calculations are shown below the overall VMT calculation.

Select Geographic Area

Inputs/Assumptions
Home-Based Trip Production Proportions by Trip Purpose	Total Proportion	Proportion to/from Home End
Home-Based Work (HBW)
Home-Based Other (HBO)
Home-Based School (HBS)
Non-Home Based (NHB)

Non-Home Trip Purpose Proportions	Retail	Office	Industrial	School	Other
Home-Based Work (HBW)
Home-Based Other (HBO)
Non-Home Based (NHB)

Residential Weekday Daily Trip Ends	Trip Ends	Internalization Reductions
Residential HBW
Residential HBO
Residential NHB attracted to home location
Residential NHB trips associated with residents of project that are generated elsewhere on network

Non-residential Weekday Daily Trip Ends	Retail Trip Ends	Office Trip Ends	Industrial Trip Ends	School Trip Ends	Other Trip Ends	Internalization Reductions
HBW
HBO
NHB
(d) Note that these trip ends can be double counted for mixed use projects/plans if internalization rate is not properly calculated

Estimated Trip Lengths in miles	HBW	HBO	NHB
Internal to Internal (II)
Internal to External (IX)
NHB (that occur elsewhere on the network)

Part A CALCULATION VMT from Internal Project Trips	Internal Residential	Internal Non Residential
HBW
HBO
NHB

Part B CALCULATION VMT from Internal-External Project Trips	IX - XI Residential	IX - XI Non Residential
HBW
HBO
NHB

Part C CALCULATION VMT from External-External Residential NHB Trips	External Residential
NHB

Summary
Total VMT Generation

Reasonableness Checks

Calculated Residential VMT per Household =
Residential VMT per Household from relevant resource =

Internalization percentage =
Internalization from relevant resource =

Average trip length for all trips =
Average trip length (mi.) from relevant resource =

Note: VMT estimate may not fully take into account effects of non-residential portion of the project. If the trip ends input to this spreadsheet included the internalization effects of the non-residential, then the VMT estimate will capture the influence of non-residential land uses on the project's VMT. However, this spreadsheet does not account for the non-residential effects on existing households. The non-residential portion of a project could increase or decrease the VMT generated by existing households depending on a number of factors such as the location, type of non-residential uses, existing balance of residential and non-residential uses, balance of wages to housing prices, etc.

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Overall VMT Calculation

Carbon dioxide emissions factor per gallon of gasoline consumed =	kilograms
Adjustment factor to account for other greenhouse gasses =

Combined average fuel economy of cars and light trucks =	miles per gallon

GHG emissions per average weekday from project/plan =	metric tons of carbon dioxide equivalent per day

Retail Pass-by Trip Adjustment	Daily Pass-by Percentage	Daily Pass-by Reduction
General Retail other than those listed below (ITE 820)	%
Supermarket (ITE 850)	%
Bank (ITE 912)	%
Health Club (ITE 492)	%
Restaurant (non-fast food - ITE 932)	%
Fast-Food Restaurant (ITE 934)	%
Gas Station (ITE 945)	%
Auto Repair (ITE 942)	%
Other Retail	%
Total Daily Retail Pass-by	%
Note: Ensure that adjacent streets can support the level of pass-by trips shown above.