HIGHWAY SHOULDERS AS VIEWED BY THE SOIL ENGINEER
SHOULDER DESIGN TO SATISFY REQUIREMENTS OF STRENGTH AND SAFETY GIVE MICHIGAN SHOULDER STRUCTURE A DUAL PURPOSE. CLIMATIC CONDITIONS IN MICHIGAN DICTATE A MINIMUM SUBBASE THICKNESS OF TWELVE INCHES OVER CLAY SUBGRADE SOILS. GOOD SUBGRADE DRAINAGE REQUIRES THAT THE SUBBASE BE BUILT OF FREE-DRAINING GRANULAR MATERIAL AND THAT IT BE EXTENDED THROUGH THE SHOULDER. THE SUBBASE THUS BECOMES A PART OF THE SHOULDER STRUCTURE WHERE IT SERVES THE DUAL PURPOSE OF PROVIDING A DRAINAGE MEDIUM FOR THE TRAFFIC LANE AND LOAD BEARING STRENGTH FOR THE SHOULDER. THE USE OF TURF SHOULDERS IS USUALLY LIMITED TO LOWER TRAFFIC ROADS BECAUSE THEY ARE POOR LOAD BEARING SOILS DURING PERIODS OF WET WEATHER. THE MODERN TREND FOR SHOULDER DESIGN IS TOWARD AN EMPHASIS ON SHOULDER STRENGTH AND A WEAR RESISTING SHOULDER SURFACE. IT IS RECOMMENDED THAT SHOULDERS BE BUILT SUFFICIENTLY STRONG TO PERMIT A LOW COST SURFACING (SUCH AS A BITUMINOUS SEAL) TO CARRY THE LOCAL NORMAL TRAFFIC THROUGHOUT THE YEAR WITHOUT SPECIAL SEASONAL RESTRICTIONS.
- Record URL:
-
Supplemental Notes:
- No 151, P 25, 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:
- Stokstad, Olaf L
- Publication Date: 1957
Media Info
- Media Type: Digital/other
- Pagination: 1p
- Monograph Title: Symposium on Highway Shoulders
-
Serial:
- Highway Research Board Bulletin
- Issue Number: 151
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Bituminous materials; Climate; Geotechnical engineering; Granular materials; Highway design; Road shoulders; Subbase (Pavements); Subgrade (Pavements); Surface drainage; Surface treating; Thickness; Turf
- Uncontrolled Terms: Subbase
- Old TRIS Terms: Bituminous surfacing; Highway drainage; Soils engineer; Thickness design
- Subject Areas: Design; Geotechnology; Highways;
Filing Info
- Accession Number: 00203413
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jul 7 1994 12:00AM