VIBRATORY MEDIAN DELINEATORS OF BITUMINOUS MATERIAL
THE REHABILITATION OF MULTILANE PAVEMENTS HAVING A NARROW, FLUSH MEDIAN BY RESURFACING WITH A BITUMINOUS HOT-MIX MATERIAL HAS CREATED THE PROBLEM OF REDELINEATION OF THE MEDIAN AREA. THIS PROBLEM HAS RAISED THE QUESTION AS TO THE DESIRABILITY OF REPLACING THIS FLUSH-MEDIAN AREA WITH SOME TYPE OF RAISED-MEDIAN SECTION WHICH, BY ITS CROSS-SECTIONAL CHARACTERISTICS, WOULD GIVE BOTH VISUAL AND PHYSICAL WARNING OF ENCROACHMENT ON THE MEDIAN AREA AND YET WOULD PERMIT SAFE TRANSVERSE CROSSING IN CASE OF INADVERTENT PHYSICAL CONTACT OR DELIBERATE CROSSINGS AT DRIVES AND PRIVATE ENTRANCES. A POSSIBLE SOLUTION IS THE DISREGARD OF VISUAL CONTRAST AS SUCH AND THE EMPLOYMENT OF AN INTERMITTENT RAISED BITUMINOUS SECTION WHICH WOULD GIVE A PHYSICAL WARNING OF ENCROACHMENT AND WHICH COULD BE PLACED ON THE BITUMINOUS RESURFACING MATERIAL EITHER DURING OR AFTER RESURFACING OPERATIONS. THIS PAPER REPORTS RESULTS OF THE PHYSICAL SENSATIONS OF THE RIDING QUALITIES OF TEST SECTIONS OF VARYING COMBINATIONS OF DESIGN ELEMENTS AT SPEEDS OF 35, 50, 70, AND 80 MPH. THE DESIGN ELEMENTS CONSIDERED WERE SPACING OF UNITS, HEIGHT OF SECTION, FACE SLOPE, LENGTH OF SECTION, PLACEMENT OF SECTION IN RELATION TO DIRECTION OF TRAVEL AND THE SHAPING OF THE NOSES. THE TESTS ESTABLISHED AN ACCEPTABLE COMBINATION OF THE VARIABLE DESIGN ELEMENTS BASED UPON PHYSICAL SENSATIONS AND THEIR EFFECTIVENESS AS A WARNING OF ENCROACHMENT AS FOLLOWS. (1) A SPACING OF APPROXIMATELY 12.5 FEET CENTER TO CENTER OF INDIVIDAUL VIBRATOR UNITS; (2) A 1-INCH HEIGHT OF SECTION; (3) A FACE SLOPE OF 30 DEG.; (4) A LENGTH OF BASE OF 6 INCHES; (5) PLACEMENT OF THE INDIVIDUAL UNITS NORMAL TO THE CENTERLINE; AND (6) ROUNDED NOSES OR ENDS OF THE INDIVIDUAL UNITS. /AUTHOR/
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Supplemental Notes:
- Vol 33, pp 103 - 112, 4 FIGS, 1 TAB. 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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Authors:
- Furbeck, R J
- Publication Date: 1954
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Thirty-Third Annual Meeting of the Highway Research Board, Washington, D.C., January 12-15, 1954
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Serial:
- Highway Research Board Proceedings
- Volume: 33
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Bituminous materials; Design; Highway delineators; Medians; Riding qualities; Vibration devices
- Old TRIS Terms: Delineators (Traffic); Vibrators
- Subject Areas: Design; Highways; Materials;
Filing Info
- Accession Number: 00203562
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: May 16 1972 12:00AM