HIGHWAY FOG
A STATE OF THE ART SURVEY IS PRESENTED ON HIGHWAY FOG. THE EFFECTS ARE EXAMINED OF FOG ON ACCIDENTS AND ON TRAFFIC. A REVIEW OF KNOWN FOG ABATEMENT METHODS SHOWS NO SOLUTION TO THE HIGHWAY FOG PROBLEM. HOWEVER, RECENT FOG SEEDING TECHNIQUES USING CAREFULLY SIZED HYGROSCOPIC NUCLEI ARE SHOWN TO PRODUCE IMPROVED VISIBILITY IN DENSE, WARM FOG OVER AIRPORTS. AUTOMOBILE REAR LIGHTING SYSTEMS CAN BE IMPROVED TO INCREASE THE DISTANCE AT WHICH VEHICLES CAN BE SEEN DURING FOGGY WEATHER. USE OF FOREST STANDS AND VEGETATION BARRIERS TO BLOCK MOVEMENT OF SHALLOW FOG FROM HIGHER ELEVATIONS TO LOW-LYING SURROUNDING AREAS APPEARS TO BE APPLICABLE TO SOME HIGHWAY FOG SITUATIONS. VISIBILITY IN FOG CAN BE INCREASED THROUGH USE OF ROADWAY LIGHTING SYSTEMS DESIGNED TO REDUCE THE SCATTERING OF LIGHT. ROADWAY GUIDANCE THROUGH FOG CAN BE ENHANCED THROUGH USE OF SYSTEMS EMPLOYING ILLUMINATED DELINEATORS. THE DESIGN OF ROADWAY CONTROL SYSTEMS TO ALERT DRIVERS TO THE PRESENCE OF DENSE FOG CONDITIONS SEEMS PRACTICAL.
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Supplemental Notes:
- 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:
- Kocmond, W C
- PERCHONOK, K
- Publication Date: 1970-2
Media Info
- Media Type: Digital/other
- Pagination: 2 p.
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Serial:
- NCHRP Research Results Digest
- Issue Number: 15
- Publisher: Transportation Research Board
Subject/Index Terms
- TRT Terms: Crash causes; Fog; Fog dispersal; Highway delineators; Highways; Hygroscopic coefficient; State of the art studies; Street lighting; Taillamps; Traffic crashes; Visibility
- Old TRIS Terms: Delineators (Traffic)
- Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors;
Filing Info
- Accession Number: 00225739
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jul 21 1970 12:00AM