Data obtained from the Chicago-Northwestern Indiana 1970/1971 home interview survey were analyzed, in order to measure certain basic characteristics of travel in the eight county study area. Specifically, the location, purpose, mode, and the time of occurrence of travel were investigated. In 1970, the number of trips occurring within the area surveyed in 1956 was about 30.5 percent greater than that observed in 1956, with most of the increase centered in suburban areas. Trips with nonwork purposes, other than to home, increased proportionately more than trips to work between 1956 and 1970. Trips with nonwork purposes constituted 38.0 percent of the total in 1970 compared to 36.1 percent in 1956, while trips to work accounted for 18.5 percent in 1970 and 20.4 percent in 1956. Among the nonwork trip purposes, shopping trips exhibited the greatest increase in relative frequency, while trips for personal business decreased the most in importance. From the 1970 data, it was observed that the amount of work travel decreased with increasing household income, except for households with very low income. The auto served as the dominant, all purpose mode throughout the region. The portion of trips by transit, including school bus, dropped from 24.3 percent in 1956 to 15.3 percent in 1970, with usage of transit from nonwork travel decreasing more than that for work. Like mass transit usage, the auto occupancy rate declined from 1.57 in 1956 to 1.47 in 1970. As observed in the 1956 survey, travel in 1970 peaked during the morning and evening work rush periods. However, in 1970 the peak periods were somewhat less pronounced, with midday travel incresing in importance. In addition, peaking of travel was observed to occur after the evening rush period in the 1970 data, but not in 1956. Throughout the study of 1970 travel data and its comparison with 1956 observations, the effects of the growth of auto usage were highly apparent. The auto largely made the suburban life style possible and, with expanding auto use, development in suburban areas mushroomed, as reflected by the observed jump in the importance of suburban trips. Likewise, the great convenience of the auto mode undoubtedly was a factor in the observed increase in the level of midday (nonwork) travel. The decline in auto occupancy can also be traced to greater auto availability. Of course, a direct consequence of increased auto use was the relative decline in travel on the mass transit modes. In general, then, it appears that the increased availability of the automobile, and the accompanying facilities to handle it, has had a major influence on the nature of urban travel.

  • Corporate Authors:

    Chicago Area Transportation Study

    300 West Adams Street
    Chicago, IL  United States  60606

    Northwestern Indiana Regional Planning Commission

    8149 Kennedy Avenue
    Highland, IN  United States  46322
  • Publication Date: 1975-11

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 67 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00150438
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 27 1981 12:00AM