trip generation equations for the daily number of trips produced by households in the reading area in 1971 have been combined with a regression equation for the distribution of household car ownership to examine the sensitivity of trip forecasts to changes in car ownership and other planning variables. for the four trip types investigated - all home-based trips by all modes and by vehicle, and work and school trips by vehicle - the results showed that it was more important to estimate population accurately than car ownership.(a)

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