CVM

Oregon Commercial Vehicle Model (CVM)

The CVM is a 3-step (generation, distribution and time-of-day choice) model. Trip generation is achieved by cross-multiplying the production and attraction factors by the corresponding employment values for each TAZ. The distribution of trips between zone pairs is achieved through iterative application of the Gravity model. In the final step of this model, trips are allocated based on the time-of-day distributions given in the input files. The user can specify time-period specific global adjustments factors for the CVM model. These global adjustments are applied to the final CVM trip tables for each mode (Car, SU-Truck and MU-Truck) and time-period. If no adjustments are needed, then these factors should be set to one for all TOD. The inputs are described below and the output files are described in CVM Outputs.

Inputs

The following table lists all the inputs required for running the CVM model.

Input	Description	Location
TAZ data file	TAZ level employment data	inputs/maz_data_export.csv
Non-Work Production Rates	Production rates for non-work trips	config/cvm/nonWorkProd_IntraTrips.csv
Work Production Rates	Production rates for work trips	config/cvm/workProd_IntraTrips.csv
Non-Work Attraction Rates	Attraction rates for non-work trips	config/cvm/nonWorkAttr.csv
Work Attraction Rates	Attraction rates for work trips	config/cvm/workAttr.csv
Non-Work Friction Factors	Non-work friction factor parameters	config/cvm/nonWorkFriction.csv
Work Friction Factors	Work friction factor parameters	config/cvm/workFriction.csv
Time Skim	R file with the distance/time skim	outputs/skims/taz_skim_sov_pm.omx
Time Skim Index	Skim matrix number in OMX file	2
TOD Specification	Period thresholds and capacity factors	config/cvm/TOD_Periods.csv
Car TOD Factors	TOD distribution of car trips	config/cvm/TOD_Car.csv
SU Truck TOD Factors	TOD distribution of single-unit trips	config/cvm/TOD_SUTruck.csv
MU Truck TOD Factors	TOD distribution of multi-unit trips	config/cvm/TOD_MUTruck.csv
TOD Calibration Factors	Global TOD-level adjustment factors	config/cvm/TOD_CalibrationFactors.csv
Number of Iterations	Maximum # of iterations in trip balancing	5

Production Rates

The following tables lists the Work and Non-Work production rates used in the ABM CVM model.

Work Production Rates

Sector	Car	SU Truck	MU Truck
Agriculture, Forestry	0.146	0.104	0.032
Mining	0	0	0
Construction	0.21	0.072	0.018
Manufacturing	0.009	0.006	0.001
Transportation, Communications, Public Utilities	0.042	0.055	0.183
Wholesale	0.087	0.037	0.033
Retail	0.043	0.012	0.001
Financial	0.045	0	0
Service**	0.117	0.004	0.001
Health	0.116	0	0
Other Services	0.115	0.005	0.001
Government	0.151	0.011	0.01

Non-Work Production Rates

Sector	Car	SU Truck	MU Truck
Agriculture, Forestry	0.243	0.33	0.048
Mining	0	0	0
Construction	0.2	0.046	0.024
Manufacturing	0.011	0.009	0.01
Transportation, Communications, Public Utilities	0.09	0.055	0.694
Wholesale	0.272	0.191	0.3
Retail	0.058	0.016	0.004
Financial	0.075	0	0
Service**	0.269	0.006	0
Health	0.113	0.001	0
Other Services	0.342	0.009	0
Government	0.205	0.028	0.003