00605658

Component

http://onlinepubs.trb.org...trr/1990/1287/1287-024.pdf

https://scholar.google.co...Rice&publication_year=1990

A study was performed with a Macintosh microcomputer to analytically assess the effects of driving with only one headlamp working (driver side or passenger side, European lowbeam, American H6054 lowbeam, and American H6054 highbeam) and the effects of misaim of the one headlamp working on the conspicuity of retroreflectorized warning signs and devices of different brightnesses at night on a straight and a left-curved section of a highway. The computer model used computes all the geometric distances and angles necessary for a selected situation involving driver, vehicle, and reflectorized target, the amount of illumination returned to the driver's eyes for selected retroreflective materials, environmental and vehicle conditions, and a multiple of the visual laboratory detection threshold value. Geometric and photometric calculations were performed for a number of selected situations involving driver, vehicle, environmental conditions, retroreflective materials, and only one headlamp working with misaim. Results show that driving with only one headlamp working can have a significant detrimental effect on the visual detection distances for reflectorized targets, especially under certain headlamp misaim conditions. Therefore, it appears to be important for manufaturers to design and produce headlamp systems and headlamps with the highest possible reliability and the longest possible headlamp life (subject to economic feasibility), to have a strict law enforcement policy (encouraging immediate headlamp replacement) aimed at drivers driving vehicles at night that have only one headlamp working, and to possibly increase the minimum required brightness level of the reflective materials used for reflectorized warning signs and devices to at least partially offset the detrimental effect on visual detection distances for a driver driving with only one headlamp working.

This paper appears in Transportation Research Record No. 1287, Traffic Flow, Capacity, Roadway Lighting, and Urban Traffic Systems 1990. 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

01411069

p. 230-243

1990

Transportation Research Record

0309050626

Figures (6) ; References (18) ; Tables (6)

Headlamps; Microcomputers; Night; Retroreflection; Simulation; Traffic signs; Visibility

Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control

TRIS, TRB, ATRI

Mar 31 1991 12:00AM

• ADAPTIVE FORECASTING OF FREEWAY TRAFFIC CONGESTION
• CAPACITY AND DELAY ESTIMATION FOR PRIORITY UNSIGNALIZED INTERSECTIONS: CONCEPTUAL AND EMPIRICAL ISSUES
• CAPACITY AND SPEED-FLOW ANALYSIS OF THE QUEEN ELIZABETH WAY IN ONTARIO
• COMBINED EFFECT OF RADIUS AND PEDESTRIANS ON RIGHT-TURN SATURATION FLOW AT SIGNALIZED INTERSECTIONS
• CONFLICT SIMULATION IN INTRAS: APPLICATION TO WEAVING AREA CAPACITY ANALYSIS
• CONGESTION IDENTIFICATION ASPECTS OF THE MCMASTER INCIDENT DETECTION ALGORITHM
• COUNTERBEAM LIGHTING, A PROVEN ALTERNATIVE FOR THE LIGHTING OF THE ENTRANCE ZONES OF ROAD TUNNELS
• DETECTING ERRONEOUS LOOP DETECTOR DATA IN A FREEWAY TRAFFIC MANAGEMENT SYSTEM
• ESTIMATING AVERAGE CYCLE LENGTHS AND GREEN INTERVALS OF SEMIACTUATED SIGNAL OPERATIONS FOR LEVEL-OF-SERVICE ANALYSIS
• ESTIMATING CAPACITY OF AN ALL-WAY-STOP-CONTROLLED INTERSECTION
• FLOW PROCESSES AT A FREEWAY BOTTLENECK
• LATE-NIGHT TRAFFIC SIGNAL CONTROL STRATEGIES FOR ARTERIAL SYSTEMS
• MEASURING DELAY AND SIMULATING PERFORMANCE AT ISOLATED SIGNALIZED INTERSECTIONS USING CUMULATIVE CURVES
• MEASURING LEVEL OF SERVICE OF TWO-LANE HIGHWAYS BY OVERTAKINGS
• MODEL OF TURNING MOVEMENT PROPENSITY
• MODELING THE LEFT-TURN ADJUSTMENT FACTOR FOR PERMITTED LEFT TURNS MADE FROM SHARED LANE GROUPS
• MULTIBAND--A VARIABLE-BANDWIDTH ARTERIAL PROGRESSION SCHEME
• ON-LINE DIVERSION PREDICTION FOR DYNAMIC CONTROL AND VEHICLE GUIDANCE IN FREEWAY CORRIDORS
• PREDICTION OF TRAFFIC FLOW BY AN ADAPTIVE PREDICTION SYSTEM
• SIMULTANEOUS OPTIMIZATION OF SIGNAL SETTINGS AND LEFT-TURN TREATMENTS
• TESTING AND FIELD IMPLEMENTATION OF THE MINNESOTA VIDEO DETECTION SYSTEM (AUTOSCOPE)
• TRAFFIC CONFLICT VALUES FOR THREE-LEG, UNSIGNALIZED INTERSECTIONS
• TRAFFIC SIGNAL DELAY MODEL FOR NONUNIFORM ARRIVALS
• WASHINGTON STATE UNIVERSITY PARKING ACTION PLAN--A CAMPUS PARKING CASE STUDY