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trip generation rates. We would focus on making these parameters useful not only for long range planning but also for traffic impact study needs. After discussion with staff on income ranges for household trip generation characteristics, we propose to update income to 1980 dollars using the appropriate price index agreed upon with the City, following procedures specified in Report 187, and recommended in Characteristics of Urban Transportation Systems, (Urban Mass Transportation Administration, 1985). We would evaluate the relationships found between various trips and auto ownership and trip generation using data available from recent origin-destination surveys conducted in Houston, Austin, and Dallas. We would also propose to evaluate these data and relationships for Texas urbanized areas of about 50,000 to 75,000 population maintained by the SDHPT, D-lO modeling. Based on this, we envision developing a table similar to Table 2, "Detailed Trip Generation Characteristics," for use in the NCHRP models developed for San Marcos. We would envision that this table would include data for five income groups (low, 1 ow- medium, medium, medium-high, and high) as is done in D-IO traffic modeling procedures. Task 5: Southwest Texas State University Special Generator Study Because of the impact of the University on San Marcos travel pat- terns, we would propose to conduct a special traffic generator study of the University. Specifically, we envision collecting traffic counts and peaking characteristics of campus traffic. This data collection would be provided by City of San Marcos personnel under a study procedure developed by the consultants and agreed upon by the City. We envision using data previously collected and identified in Task 2. Task 6: Evaluation of Household, Auto Ownership, and Trip Generation Rates Using data available from the Texas city origin-destination surveys, the journey-to-work census data and D-IO modeling equations for cities 50,000 to 75,000 population, we would compare Figure 3, "Percentage of Households, by Autos Owned per Household versus Income," for the 50,000 to 100,000 population range. Based on the analysis, we would recommend a set of trip generation curves for San Marcos. Task 7: Automobile Occupancy Study In close cooperation with the City of San Marcos, we enV1S10n a brief check on the automobile occupancy rates used in the NCHRP report. Specifically we would propose to develop the study procedures (locations, times, data collection sheets) and analyze the data. We would envision using San Marcos staff to collect the data. A report on the study results would be prepared for the data to be included in the model. 3