the planning of improvements to urban highway and public transport systems normally relies upon the construction of a representative model of travel using base year survey data and its subsequent application to provide estimates of travel in future years. reading is one of three medium sized towns for which travel surveys were undertaken in 1962 to develop and compare relationships between the amount of travel and level of urban activity in each area. the 1971 repeat survey for reading provides a second set of matching data for examining the stability of such relationships over time and the implications for current forecasting procedures. an account is given of the repeat survey and of the checking procedures which have been applied to the data collected. population estimates for the survey area are compared with the results of the 1971 national population census and the survey trip data are calibrated against screenline observations. it is evident that about 50 percent of the less regular trips made by residents in the survey area go unreported. a number of travel statistics are presented in summary form and a feature of particular interest is the flattening and earlier onset of the evening travel peak. the ongoing programme of comparative analytical studies into the temporal stability of travel relationships and the adequacy of trip generation techniques used in transportation planning is described. (a)

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