00218562

Component

http://onlinepubs.trb.org...s/hrr/1969/298/298-004.pdf

THE TWO-FOLD PROBLEM OF DETECTING FROST, ICE AND SNOW CONDITIONS ON THE DECK AREAS OF HIGHWAY BRIDGES AND OVERPASSES, AND PROVIDING SUITABLE WARNINGS TO MOTORISTS HAS BECOME AN INCREASINGLY IMPORTANT AND CRITICAL HIGHWAY SAFETY PROBLEM ON HIGH-SPEED INTERSTATE HIGHWAYS. THE AUTHOR DECRIBES A SYSTEM DEVELOPED BY HOLLEY CARBURETOR CO. THAT DETECTS THESE CONDITIONS THROUGH THE USE OF A COMBINATION AMBIENT AIR AND RELATIVE HUMIDITY SENSOR ON THE BRIDGE RAILING ALONG WITH TWO OTHER SENSORS BURIED IN THE BRIDGE DECK. THE RESULTS OF A THREE AND ONE-HALF YEAR EVALUATION PROGRAM OF THE SYSTEM THAT ACTUATES A FLASHING SIGN ON THE FLINT RIVER BRIDGE ON INTERSTATE 75 NEAR FLINT, MICHIGAN, ARE DESCRIBED. THE PAPER ALSO INTRODUCES A NEW DETECTION SYSTEM, DUAL-CHANNEL, FOR FROST, ICE AND SNOW. THIS SYSTEM SPLITS THE ANTICIPATORY FROST AND THE SNOW AND ICE SIGNALS INTO TWO SEPARATE SIGNALS. THE ANTICIPATORY SIGNAL CAN BE RELAYED AS AN EARLY WARNING TO ALERT MAINTENANCE STAFFS TO SEND AN OBSERVER TO EXAMINE THE CONDITIONS FIRST-HAND AND PASS A JUDGMENT ON THE NEED FOR CHEMICAL APPLICATION OR SIGN ACTUATION. THE EARLY WARNING SIGNAL CAN ALSO BE USED TO SWITCH-ON ELECTRIC HEATERS EMBEDDED IN THE DECK. THE SEPARATE ICE AND SNOW SIGNAL CAN BE USED TO ACTUATE A WARNING FLASHER. ALSO MENTIONED ARE TWO NEW APPLICATIONS OF THE DUAL-CHANNEL SYSTEM ON HIGHWAYS AND THE FIRST APPLICATION OF A SIMILAR SYSTEM ON AN AIRPORT RUNWAY. /AUTHOR/

Paper sponsored by Committee on Snow and Ice Control and presented at the 48th Annual Meeting. 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.

01410237

pp 17-24

1969

Highway Research Record

Digital/other

Figures (7)

Airport runways; Bridge decks; Bridge railings; Detection and identification; Detectors; Electric heating; Frost; Highway bridges; Humidity; Ice; Overpasses; Pavements; Sensors; Snow; Traffic signs; Warning systems

Interstate Highway System

Highways; Maintenance and Preservation; Pavements

TRIS, TRB

Mar 9 1970 12:00AM

• ASPHALTIC PAVEMENT PATCHING IN KANSAS
• CHANGING CHARACTER OF PAVEMENT MAINTENANCE
• PERFORMANCE BUDGETING FOR MAINTENANCE: A BUDGET BASED ON QUALITY, QUANTITY AND PRODUCTIVITY STANDARDS
• THE USE OF SALT FOR WINTER MAINTENANCE OF ROADS IN GREAT BRITAIN