Controversy over the relation between air quality requirements and urban transportation planning appears to center around two basic issues. The first is whether the implementation of transportation measures that improve air quality is consistent with the achievement of other transportation objectives. The second concerns the changes in the planning process needed to accommodate air quality requirements. This paper outlines the basic elements of a potential resolution of these issues. The transportation measures that have been proposed to improve air quality are virtually identical to the measures now being proposed to achieve a wide variety of other transportation objectives. However, the various measures are not necessarily equally effective in improving air quality and achieving other objectives. Thus, the process of selecting transportation measures for implementation often will involve making trade-offs between air quality objectives and other objectives. The need for such trade-offs is recognized by the Environmental Protection Agency, and the changes in the transportation planning process needed to enable the trade-offs to be made are consistent with current planning trends. However, three problem areas may require further attention in the future: encouraging the implementation of innovative demand-management approaches, developing procedures for mediating disputes between EPA and state and local agencies over the rate at which transportation change should take place, and preventing the planning process from becoming overly cumbersome. /Author/

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    • From TRB Special Report No. 172, Transportation System Management, proceedings of a conference held November 7-10, 1976, conducted by the Transportation Research Board, and sponsored by the Urban Mass Transportation Administration and the Federal Highway Administration of the U.S. DOT in cooperation with the Institute of Transportation Engineers. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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    Transportation Research Board

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  • Authors:
    • Horowitz, Joel
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  • Publication Date: 1977

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  • Media Type: Digital/other
  • Features: References;
  • Pagination: pp 122-127
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  • Accession Number: 00179096
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Sep 14 1981 12:00AM