00223297

Component

https://onlinepubs.trb.or...bproceedings/11/11-024.pdf

A REPORT IS PRESENTED ON AN EXTENSIVE SERIES OF TESTS OF MOTOR VEHICLE HEADLIGHTING INCLUDING: VISIBILITY DISTANCES ON STRAIGHT ROADS, VISIBILITY DISTANCES IN GENERAL BOTH WITH AND WITHOUT OPPOSING CARS, SPREAD NEEDED FOR HEADLIGHT BEAMS AND GLARE AND INTENSITY OF ILLUMINATION NEEDED TO ENABLE THE DRIVER TO SEE THE ROAD SHOULDER. A STRIKING CONCLUSION FROM THE TESTS OF BEAM SPREAD IS THAT THE GREAT EMPHASIS UPON SHARP CUT-OFF AND EXACT AIMING IN VOGUE A FEW YEARS AGO HAD NO RATIONAL BASIS IN HEADLIGHT PERFORMANCE. A MOST IMPORTANT ELEMENT IN AVOIDING DANGER IN MEETING OTHER CARS WAS FOUND TO BE ADEQUATE LIGHT ON THE ROADSIDE SINCE SIGHT TO THE REAR OF THE OPPOSING CAR IS ALMOST NEGLIGIBLE. CONCLUSIONS DEFINING HEADLIGHTING CONDITIONS CONDUCIVE TO BEST RESULTS AND SUGGESTIONS FOR FUTURE STUDY ARE PRESENTED. /AUTHOR/

Vol 11, Pt 1, PP 388-409, 23 FIG. 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.

01490418

Halvorson, C

1932

Highway Research Board Proceedings

Digital/other

Drivers; Glare; Headlamps; Light; Motor vehicles; Opposing traffic; Visibility; Vision

Highways; Safety and Human Factors

TRIS, TRB

Jun 1 1971 12:00AM

• A NEW THEORY OF FROST HEAVING
• DISCUSSION ON FROST HEAVING
• DISCUSSION ON LOW COST BRIDGES
• ECONOMICS OF LOW COST BRIDGES
• ECONOMICS OF LOW COST HIGHWAY BRIDGES
• ECONOMICS OF LOW COST HIGHWAY BRIDGES
• FACTORS AFFECTING VOLUME CHANGES IN CONCRETE AND THEIR SIGNIFICANCE IN DESIGN
• FIELD EXPERIMENTS IN SUBGRADE DRAINAGE AND TREATMENT
• FIELD METHODS FOR MEASURING TIRE WEAR
• Fillers and Bedding Courses for Brick Pavements
• FUNCTIONS OF STEEL REINFORCEMENT IN CONCRETE PAVEMENTS AND PAVEMENT BASES
• LOAD LIMITATIONS ON HIGHWAYS
• LOW COST STEEL HIGHWAY-BRIDGES
• REPORT ON CULVERT INVESTIGATION
• REPORT ON STATE CONTROL OF TRAFFIC
• REPORT ON TRAFFIC LAW OBSERVANCE AND ENFORCEMENT METHODS
• RESISTANCE OF CONCRETE TO FROST ACTION AS AFFECTED BY THE WATER-CEMENT RATIO
• SOME PRINCIPLES OF SOIL SURVEYING AND SOIL MAPPING FOR ROAD PURPOSES
• TAXATION AND EXPENDITURES IN THE STATE OF WISCONSIN
• THE AIR RESISTANCE OF MOTOR VEHICLES
• THE ECONOMICS OF LOW COST BRIDGES
• THE EFFECT OF HOT CEMENT ON TIME OF SET AND WORKABILITY OF CONCRETE
• THE EFFECTIVENESS OF CALCIUM CHLORIDE AS A DUST PALLIATIVE AND ITS VALUE TO GENERAL ROAD MAINTENANCE
• THE SIGNIFICANCE OF SODIUM SULFATE AND FREEZING AND THAWING TESTS OF MINERAL AGGREGATES
• TRAFFIC CAPACITY
• TREATMENT OF ICY PAVEMENTS
• USE OF CONCRETE AS AN ECONOMIC HIGHWAY BRIDGE MATERIAL
• VOLUME CHANGES IN CONCRETE SLABS IN THE FIELD