ENGINEERING CONSIDERATIONS

ENGINEERING CONSIDERATIONS ARE DISCUSSED FOR JOINT DEVELOPMENT AND MULTIPLE-USE PROJECTS. THE ADVANTAGES AND LIABILITIES OF THE DEPRESSED AS OPPOSED TO THE ELEVATED FREEWAY ARE COMPARED. THE DEPRESSED URBAN FREEWAY DETRACTS LEAST FROM SURROUNDING URBAN COMMUNITY IN THAT AESTHETICS ARE NOT MARRED BY EMBANKMENTS OR OVERHEAD STRUCTURES, AND IT OFFERS MORE OPPORTUNITIES FOR A SAFER DESIGN THAN AFFORDED BY ELEVATED FREEWAYS. THE ADVANTAGE OF ELEVATED FREEWAYS IS THE POSSIBLE UTILIZATION OF THE GROUND SURFACE BELOW THE STRUCTURE AND THE RIGHT-OF-WAY TAKING IS NORMALLY MUCH LESS THAN WOULD BE REQUIRED FOR A DEPRESSED FREEWAY WITH THE RESULT THAT THE LAND REQUIREMENTS FOR THE FACILITY ARE MINIMIZED WITH SAVINGS OF RIGHT-OF-WAY COSTS. AN ELEVATED STRUCTURE WILL REQUIRE HIGHER MAINTENANCE COSTS. FREEWAY RAMPS CANNOT BE CONSTRUCTED INDISCRIMINANTLY AT LOCATIONS TO PROVIDE ACCESS FOR SOME JOINT PROJECT WITHOUT SERIOUSLY AFFECTING THE CAPACITY OF THE SYSTEM. IN CONSIDERIGN MULTIPLE USE OR JOINT DEVELOPMENT, THE FUNCTIONS SELECTED SHOULD NOT INCREASE PEAK-HOUR TRAFFIC FLOW BY ANY SUBSTANTIAL AMOUNT. MULTIPLE-USE PROJECTS CAN RESTRICT FUTURE EXPANSION OF THE TRANSPORTATION FACILITY. ADEQUATE PROVISIONS SHOULD BE MADE FOR LIGHTS, OPEN SPACE, AND AIR CIRCULATION, AND CONSIDERATION SHOULD BE GIVEN TO POLLUTION, NOISE, DUST, AND DISTRACTIONS FOR THE USER OF THE FACILITY AND FOR THE ADJACENT MULTIPLE-USE ACTIVITIES. PEDESTRAINS SHOULD BE SEGREGATED FROM VEHICULAR TRAFFIC. PROPER PROVISION SHOULD BE MADE FOR FIRE AND EXPLOSION HAZARDS IN DESIGNING THE STRUCTURE WITHIN THE RIGHT-OF-WAY. EVERY EFFORT SHOULD BE MADE TO PROVIDE FOR THE NORMAL MOVEMENT OF TRAFFIC DURING THE CONSTRUCTION PERIOD. FRINGE LANDSCAPING AND OTHER TECHNIQUES SHOULD BE UTILIZED TO SHIELD BUSINESSES AND RESIDENCES ADJACENT TO THE FREEWAY FROM THE HIGHWAY ACTIVITIES DURING CONSTRUCTION. IN THE DESIGN OF THE FREEWAY, SPECIAL CONSIDERATION SHOULD BE GIVEN TO THE MAINTENANCE AND OPERATION OF THE FACILITY. WHERE MULTIPLE-USE ACTIVITIES ARE LOCATED UNDER THE ROADWAY STRUCTURE, NEW AND BETTER WAYS MUST BE FOUND TO PROVIDE DRAINAGE AND SNOW REMOVAL. ADEQUATE RIGHT-OF-WAY AND ACCESS MUST BE PROVIDED IN ORDER TO ALLOW UNIMPEDED PROGRESS FOR EMERGENCY VEHICLES, BOTH FOR THE ACTIVITIES WITHIN THE TRANSPORTATION RIGHT-OF-WAY AND THE ADJACENT FACILITIES.

  • Record URL:
  • Supplemental Notes:
    • pp 119-128, 1 FIG 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
  • Authors:
    • Nusbaum, R F
  • Publication Date: 1969

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00201676
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 25 1994 12:00AM