CRITERIA FOR CONTOUR GRADING AND DRAINAGE PLANS FOR INTERCHANGES AND OTHER SPECIAL AREAS - A TOTAL DESIGN CONCEPT

CONTOUR GRADING AND DRAINAGE PLANS FOR FREEWAY INTERCHANGES AND OTHER SPECIAL AREAS CAN BE USED TO CORRELATE THE DESIGN AND CONSTRUCTION ELEMENTS WITH EACH OTHER AND WITH THE TOPOGRAPHY TO CREATE A TOTAL DESIGN AND THUS REDUCE MAINTENANCE, INCREASE SAFETY AND IMPROVE THE APPEARANCE OF THE ENTIRE AREA. THESE PLANS MUST BE COMPETENTLY PREPARED, REVIEWED AND APPROVED DURING THE PRELIMINARY STAGE, AND FINALIZED FOR INCLUSION WITH THE CONSTRUCTION PLANS. HIGHWAY SLOPES SHOULD BLEND INTO THE ADJACENT TERRAIN AND TRANSITIONS BETWEEN SLOPE RATIOS OUGHT TO BE LONG AND NATURAL IN APPEARANCE. STEEP ROADSIDE EARTH SLOPES SHOULD BE AVOIDED THROUGHOUT INTERCHANGE AREAS. FLATTENED SLOPES WITH FLOWING CONTOURS AND BROAD ROUNDED DRAINAGE WAYS OR SWALE-LIKE DEPRESSIONS ARE DESIRABLE WHERE POSSIBLE TO ENCOURAGE GOOD TURF, FACILITATE POWER MOWING, INCREASE SAFETY, PROVIDE A MORE PLEASING APPEARANCE AND REDUCE THE NEED FOR GUARDRAILS. ACCURATE PLOTTING OF PAVEMENT AND SHOULDER CONTOURS IS AN AID TO DESIGN AND VISUAL PROOF OF THE CORRELATION OF CONSTRUCTION ELEMENTS WITH EACH OTHER, AS WELL AS REVEALING THE DIRECTION OF SURFACE DRAINAGE FLOW.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 44-48
  • Monograph Title: Roadside development
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00204578
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Dec 12 1994 12:00AM