Travel Demand Model - OKI

OKI/MVRPC Travel Demand Model – Version 6.0The results for all estimation runs are shown in Appendix 2. These runs include the followingmodels:• unconstrained cost coefficient (see run #29),• separate coefficients for each out-vehicle time component (first wait, transfer wait and walkaccess time),• unconstrained out-of-vehicle time coefficient (see run #38),• an indicator variable for the ratio of autos to workers in the household,• a low income indicator variable,• an indicator variable for the number of workers in the household, and• separate coefficients on operating cost and parking cost.The data did not allow the estimation of a satisfactory nesting structure, and therefore thelogsum coefficients and structure for the HBO purpose will be assumed to be equal to thecoefficients listed in Table 4.3.The final HBO utility expressions to be used in model application are listed below. In theseequations, all times are expressed in minutes and all costs are expressed in 1995 cents. "LB"stands for local bus and "EB" stands for express bus. The "K??? TM " terms are the mode specificconstants, stratified by time period (T) and market segment (M). Please refer to Section 7 forthe constants' final, calibrated values. Note that parking and auto operating costs are not sharedamong a vehicle's occupants, consistent with the finding that most carpools are composed ofmembers of the same household. Note also that these utility expressions, unlike the choice setused for model estimation, do differentiate between local and express bus, as well as betweenpark&ride vs. kiss&ride transit access.In model application, utilities corresponding to lower level choices are divided by the appropriatelogsum coefficients. Hence, U(drive-alone) is divided by 0.85, while all the other utilities aredivided by the product (0.85*0.55).• U(drive-alone) TM = -0.0085 * (highway travel time + terminal parking time) +-0.0017 * (parking cost + auto operating cost) +KDA TM• U(share-ride 2) TM = -0.0085 * (highway travel time + terminal parking time) +-0.0017 * (parking cost + auto operating cost)• U(share-ride 3+) TM = -0.0085 * (highway travel time + terminal parking time) +-0.0017 * (parking cost + auto operating cost) +K3P TM• U(LB,walk) TM = -0.0085 * in-vehicle time +-0.0169 * (centroid walk time + transfer walk time) +-0.0169 * first wait time +-0.0169 * transfer wait time +-0.0017 * fare +KLBW TMMode Choice - Home-Based Other Model Estimation 25