00183805

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http://onlinepubs.trb.org...r/1978/665v2/665v2-030.pdf

https://scholar.google.co...chie&publication_year=1978

The current AASTHO Specification provides designers with static design criteria and/or crash test criteria to qualify a bridge railing system. Accordingly, a bridge railing system meeting the AASHTO specifications is used on any bridge regardless of vehicle mix, traffic volume, and speed and bridge geometry. The Multiple Service Levels Approach (MSLA) procedure for selecting bridge railings is a new approach differing markedly from traditional practice. The objective of the MSLA is to provide a level of motorist protection consistent with the degree of traffic hazards present at a highway site. With the MSLA, the degree of risk is the combined measurement of the probability of an impact occurrence, the probability of collision severity and the consequences of that impact occurrence. Accordingly, the procedures described in this paper consider encroachment rates, traffic volume, vehicle mix, category speed, shoulder widths, and horizontal alignment as these factors relate to probability of an impact occurring and the severity probability of the impacts. Using a collision severity index as an indicator of bridge railing performance requirements, six service levels were established. By setting critical impacts corresponding to a uniform probability factor, service level requirements are determined for a site. Thus, using the MSLA procedures, a designer selects a higher service level device at locations where collisions are numerous and severe; and lower service level devices are indicated for the relatively safe or improbable accident locations. Since the higher service devices are generally more costly to construct, highway safety funds can be more wisely expended by selecting the service level appropriate for each location. /Author/

This paper appeared in Transportation Research Record No. 665, Bridge Engineering, Volume 2. Proceeding of a conference conducted by the Transportation Research Board, September 25-27, 1978.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

01489599

pp 245-254

1978

Transportation Research Record

Bridge Engineering Conference, 1st, 1978, St Louis, Missouri, USA

0309026970

Print

Figures (4) ; References (14) ; Tables (6)

Alignment; Bridge railings; Crash rates; Design; Highway safety; Level of service; Motor vehicles; Road shoulders; Soil stabilization; Specifications; Speed; Traffic crashes; Traffic speed; Traffic volume

Design criteria; Motor vehicle accidents

Bridges and other structures; Design; Geotechnology; Highways

TRIS, TRB

Dec 12 1978 12:00AM

• A CRITICAL EXAMINATION OF THE WAVE EQUATION
• AERODYNAMIC STABILITY OF TWO CABLE-STAYED BRIDGES
• ANALYSIS AND TESTING OF A TRAPEZOIDAL BOX GIRDER BRIDGE
• APPLICATION AND DESIGN OF PRESTRESSED DECK PANELS
• APPLICATION OF PREFABRICATED HOLLOW STEEL DECKS TO BRIDGE CONSTRUCTIONS
• CONCRETE CABLE-STAYED BRIDGES
• CONSIDERATIONS IN THE DEVELOPMENT OF AN EARLY WARNING VESSEL/BRIDGE COLLISION SYSTEM
• CURRENT PRACTICE IN DESIGN AND INSTALLATION OF DRIVEN PILES
• DEVELOPMENT OF A SIMPLIFIED METHOD OF LATERAL LOAD DISTRIBUTION FOR BRIDGE SUPERSTRUCTURES
• DYNAMIC RESPONSE OF A SINGLE TRACK RAILWAY TRUSS BRIDGE
• DYNAMIC RESPONSE OF BRIDGES
• ECONOMICAL STRUCTURES FOR LOW-VOLUME ROADS
• FATIGUE TESTS OF PRESTRESSED GIRDERS WITH BLANKETED AND DRAPED STRANDS
• INCREASING THE SEISMIC RESISTANCE OF EXISTING HIGHWAY BRIDGES
• LABORATORY AND FIELD STUDIES OF A PEDESTRIAN BRIDGE COMPOSED OF GLASS REINFORCED PLASTIC
• METHODS OF CALCULATION OF THE WIND-INDUCED RESPONSES OF SUSPENDED-SPAN BRIDGES
• MODEL STUDIES OF DOUBLE-CELL BOX GIRDER BRIDGE WITH INTERMEDIATE DIAPHRAGMS
• PRACTICAL BRIDGE RETROFIT CONCEPTS TO REDUCE DAMAGE PRODUCED BY SEISMIC MOTIONS
• RECENT DEVELOPMENT OF CONSTRUCTION TECHNIQUES IN CONCRETE BRIDGES
• REDUCING THE RISK OF CATASTROPHIC BRIDGE FAILURES
• SEGMENTAL AND STAGE CONSTRUCTION OF PRESTRESSED CONCRETE BOX GIRDER BRIDGES
• SEGMENTAL BRIDGE CONSTRUCTION IN WESTERN EUROPE--IMPRESSIONS OF AN IRF STUDY TEAM
• STRUCTURAL PROBLEMS FOR THE MESSINA NARROWS BRIDGE
• SYSTEMS CONSTRUCTION TECHNIQUES FOR SHORT-SPAN CONCRETE BRIDGES
• TEST RESULTS FROM THE CONESTOGO RIVER BRIDGE
• THE DESIGN AND CONSTRUCTION OF THE NEW RIVER GORGE BRIDGE
• THE DEVELOPMENT OF THE ONTARIO HIGHWAY BRIDGE DESIGN CODE
• TRAFFIC LOADING OF LONG SPAN BRIDGES
• TRANSVERSE POST-TENSIONING OF LONGITUDINALLY LAMINATED TIMBER BRIDGE DECKS
• WEB STRESSES IN PRESTRESSED CONCRETE BRIDGE BEAMS HAVING DISCONTINUOUS TENDONS