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QUESTION 3: Trip generation in a traffic zone is predicted based on the household size and vehicle ownership of sample households selected for the travel survey as follows: Trip rates (trips/household) Vehicles/household Persons/household 0 2+ 2.6 4.0 4.0 2 4.8 6.7 8.2 3 7.4 9.2 11.2 9.2 11.5 14.7 5+ 11.2 13.7 17.2 4 (a) Calculate the forecasted number of trips for each household size and vehicle ownership for a target year if the number of households is forecasted as follows. Forecasted number of households in a target year Vehicles/household Persons/household 0 1 2+ 1 100 300 150 2 110 250 SO 3 90 250 50 150 210 60 5+ 20 50 30 4 (b) Alternatively, the above travel survey data were used to calibrate the following linear regression equation for the expected trip generation rate by a household: Trip rate -0.85 +2.6289. NPERSON +2.0115 *NVEH where NPERSON - no. of persons per household (if 5 or more, NPERSON - 5); NVEH - no. of vehicles per household (if 2 or more, NVEH = 2). Calculate the forecasted number of trips for each household size and vehicle ownership for a target year using this estimated trip rate. (c) Compare the methods used in (a) and (b) in terms of underlying assumptions and limitations QUESTION 3: Trip generation in a traffic zone is predicted based on the household size and vehicle ownership of sample households selected for the travel survey as follows: Trip rates (trips/household) Vehicles/household Persons/household 0 2+ 2.6 4.0 4.0 2 4.8 6.7 8.2 3 7.4 9.2 11.2 9.2 11.5 14.7 5+ 11.2 13.7 17.2 4 (a) Calculate the forecasted number of trips for each household size and vehicle ownership for a target year if the number of households is forecasted as follows. Forecasted number of households in a target year Vehicles/household Persons/household 0 1 2+ 1 100 300 150 2 110 250 SO 3 90 250 50 150 210 60 5+ 20 50 30 4 (b) Alternatively, the above travel survey data were used to calibrate the following linear regression equation for the expected trip generation rate by a household: Trip rate -0.85 +2.6289. NPERSON +2.0115 *NVEH where NPERSON - no. of persons per household (if 5 or more, NPERSON - 5); NVEH - no. of vehicles per household (if 2 or more, NVEH = 2). Calculate the forecasted number of trips for each household size and vehicle ownership for a target year using this estimated trip rate. (c) Compare the methods used in (a) and (b) in terms of underlying assumptions and limitations