TECHNICAL SUPPLEMENT TO HIGHWAY USE AND HIGHWAY COSTS

HIGHWAY TRANSPORTATION COSTS IN THE STATE OF PENNSYLVANIA ARE REVIEWED. THREE CLASSES OF HIGHWAY COSTS ASSIGNABLE TO MOTOR VEHICLES ARE: (1) COSTS, GENERATED BY USE, OF PRESERVING THE CARRYING CAPACITY OF EXISTING ROADS, (2) COSTS OF NEW CONSTRUCTION AND RECONSTRUCTION, AND (3) ADMINISTRATIVE COSTS. ENGINEERING ANALYSES OF EXISTING HIGHWAYS ARE MADE FOR: (1) THE EXAMINATION OF AVAILABLE INFORMATION FOR THE PRORATION, TO VEHICLES UTILIZING THE HIGHWAYS, OF COSTS OF PRESERVING CARRYING CAPACITIES OF EXISTING HIGHWAYS, AND (2) THE TESTING OF HIGHWAY DESIGN SYSTEMS AGAINST PERFORMANCE OF ACTUAL HIGHWAYS. COSTS OF NEW CONSTRUCTION AND RECONSTRUCTION OF HIGHWAY FACILITIES FOR ANTICIPATED NUMBERS AND TYPES OF VEHICLES TAKE INTO ACCOUNT ENGINEERING RELATIONSHIPS BETWEEN NUMBERS AND WEIGHTS OF AXLES AND HIGHWAY CROSS SECTIONS, AS WELL AS ENGINEERING RELATIONSHIPS BETWEEN THE DIMENSION AND PERFORMANCE CHARACTERISTICS OF VEHICLES AND REQUIRED GRADIENTS, CURVATURES, AND NUMBER OF LANES OF HIGHWAYS. CONCLUSIONS MADE ARE THAT: (1) SATISFACTORY HIGHWAY PAVEMENTS, BOTH RIGID AND FLEXIBLE, MAY BE DESIGNED AND CONSTRUCTED FOR ALL CLASSES OF TRAFFIC, (2) ACCURATE TRAFFIC DATA, INCLUDING VOLUME AND LOADING CHARACTERISTICS, ARE NECESSARY FOR ADEQUATE DESIGN OF HIGHWAY PAVEMENTS, (3) ACCURATE MEASUREMENT OF SUBGRADE SUPPORTING POWER, UNDER THE WORST CONDITIONS IN ACTUAL USE, AND PROPER TREATMENT OF SUBGRADE TO DEVELOP MAXIMUM SUPPORT ARE REQUIRED FOR OPTIMUM PAVEMENT CONSTRUCTION, (4) LOSS OF SUBGRADE SUPPORT CAN BE PREVENTED BY EFFECTIVE PERMANENT DRAINAGE, (5) SUBGRADE CONDITIONS IN PENNSYLVANIA GENERALLY REQUIRE A MINIMUM THICKNESS OF 12 INCHES OF SPECIAL SUBGRADE UNDER RIGID PAVEMENTS, (6) PRESENT DESIGN THICKNESS OF RIGID PAVEMENT IS SATISFACTORY, (7) PAVEMENT LIFE, FOR RIGID AND FLEXIBLE PAVEMENTS, MAY BE INCREASED MATERIALLY BY THE USE OF WIDER LANES, (8) CURRENT SECONDARY DESIGN DETAILS ARE SATISFACTORY FOR PRESENT AXLE LOADINGS WHERE ADEQUATE SUBGRADE SUPPORT IS PROVIDED, AND (9) CONSTRUCTION STANDARDS AND SPECIFICATIONS REQUIRE CONSTANT REVIEW AND STUDY.

  • Supplemental Notes:
    • 94 Pp, 21 FIG, 23 TAB, 42 REF, 3 APP
  • Corporate Authors:

    Joint State Government Commission

    ,    
  • Publication Date: 1953

Subject/Index Terms

Filing Info

  • Accession Number: 00201442
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 18 1994 12:00AM