Download or read book Headlamp Illumination Provided to Sign Positions by Passenger Vehicles written by Susan T. Chrysler and published by . This book was released on 2003 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic sign visibility at night is largely determined by sign luminance. Sign luminance, in turn, is determined by viewing geometry, retroreflective characteristics of the sign material, and headlamp illumination. Computer modeling of sign luminance has advanced to allow sign luminance to be predicted based on data sets of retroreflective material performance and headlamp luminous intensity matrices. This research project sought to assess the amount and variability of illumination provided to sign positions by a sample of Texas vehicles. The Texas Transportation Institute measured vehicle dimensions and headlamp illuminance at prespecified points representing typical sign locations. Data collection included 25 passenger cars and 21 light trucks and vans. Vehicles were measured without aiming, but after cleaning the headlamps. Each lamp was measured independently and total illuminance at sign locations was calculated. The project found that the vehicle dimensions specified in computer models encompassed the vehicles measured. The illumination values obtained were also in the range of those provided by the composite lamps in the existing computer models. Theoretical sign luminance values for different types of retroreflective sheeting were calculated using the median illumination values from the vehicles measured. The project confirms the validity of using computer models to predict sign luminance. It also confirmed current TxDOT retroreflective sheeting policy. It is recommended that TxDOT consistently aim the headlamps of vehicles used to perform nighttime sign inspections to assure consistency of sign appearance.
Download or read book Emergency Vehicle Visibility and Conspicuity Study written by and published by FEMA. This book was released on with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characteristics and Needs for Overhead Guide Sign Illumination from Vehicular Headlamps written by Eugene Russell and published by . This book was released on 1999 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: A team of Kansas State University researchers was given a contract to determine the minimum luminance requirements for overhead guide signs and to determine if the illuminance from vehicle headlamps on highways was sufficient to provide drivers with this required minimum luminance. This report covers a literature review to determine the minimum luminance value needed, an overview of the equipment developed for field studies of vehicle headlamp illuminance, results of a small laboratory study to determine minimum luminance of highway guide signs, and the results of field studies to determine illuminance values from a sample of the fleet of vehicles on highways, and the results of a study of illuminance values obtained from the headlamps of 50 known vehicles of varying ages and types.
Download or read book Code of Federal Regulations written by and published by . This book was released on 2001 with total page 1296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special edition of the Federal Register, containing a codification of documents of general applicability and future effect ... with ancillaries.
Download or read book The Code of Federal Regulations of the United States of America written by and published by . This book was released on 1987 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Code of Federal Regulations is the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government.
Download or read book The Locations of Headlamps and Driver Eye Positions in Vehicles Sold in the U S A written by and published by . This book was released on 1996 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information about the locations of headlamps and driver eye positions is important in estimating the performance of a variety of traffic-safety equipment, such as retroreflective traffic signs and markings, rearview mirrors, and headlamps. Driver eye height is also an important factor in determining safe sight distances on vertical curves. However, no comprehensive database concerning the locations of headlamps and driver eye positions exists for the current U.S. fleet. The present study was designed to obtain such information for vehicles currently sold in the U.S. The information was derived from the 15 best-selling cars and the 15 best-selling light trucks and vans. These 30 vehicles represent 52% of all vehicles sold in the U.S. in 1995. For headlamp locations, actual vehicle measurements were made. For driver eye positions, dimensional information provided by vehicles manufacturers was used to estimate the location of the driver seating reference point. An UMTRI-developed computer model that predicts the relationship of the driver eye position to the driver seating reference point was then used to calculate driver eye positions. The obtained information includes sales-weighted mean dimensions for the locations of headlamps and driver eye positions, calculated separately for cars and for light trucks and vans.
Download or read book Guidelines for Nighttime Visibility of Overhead Signs written by Paul John Carlson and published by . This book was released on 2016 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 1. Introduction -- chapter 2. Background -- chapter 3. Closed-course study -- chapter 4. Open-Road study -- chapter 5. Research findings -- References -- appendix A. Incremental effects of light sources and sign sheeting on legend luminance for overhead guide signs -- appendix B. Assessment of background complexity using digital images of roadway scenes by image processing -- appendix C. Open-road study details -- appendix D. Guidelines for Nighttime overhead sign visibility.
Download or read book Federal Motor Vehicle Safety Standards and Regulations written by United States. National Highway Traffic Safety Administration and published by . This book was released on 1994 with total page 1172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Federal Register written by and published by . This book was released on 2013-04 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lighting Technology and Human Factors written by and published by . This book was released on 2005 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Title 49 Transportation written by Federal Register and published by ProStar Publications. This book was released on 2007-10 with total page 1284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Federal Motor Vehicle Safety Standards and Regulations written by and published by . This book was released on with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Code of Federal Regulations written by Congressional Information Service and published by ProStar Publications. This book was released on 2001 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lighting for Driving Roads Vehicles Signs and Signals Second Edition written by Peter Boyce and published by CRC Press. This book was released on 2024-09-04 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vehicle, road, sign, and signal lighting are provided to enable drivers to reach their destinations quickly and safely. However, the attention given to how these forms of lighting function is likely to change as new technology is introduced and understanding of ergonomics and human factors improves. Lighting for Driving: Roads, Vehicle, Signs and Signals, Second Edition shows the crucial role lighting plays in road safety and examines how it could be used more effectively. With light-emitting diodes (LEDs) becoming the lighting source of choice for transport planners and vehicle designers, this book integrates information on road lighting, vehicle lighting, signs, and signals in one handy volume. International in scope and updated for this new edition, this book features lighting examples from the USA, the UK, France, Germany, The Netherlands, Denmark, Sweden, Norway, Finland, Japan, Australia, and New Zealand. Lighting in common vehicle types including cars, vans, trucks, and motorcycles is covered as well as the visibility of pedestrians and cyclists to drivers. Coverage extends to road lighting, traffic markings, vehicle designs, and internal lighting and weather conditions. Now fully updated, a final chapter looks at the future of lighting in relation to driving. The book will help the reader to understand how lighting systems on roads and vehicles work by explaining the thinking and scientific reasoning behind various forms of lighting and analyzing their contribution to the driver’s understanding of real and potential road hazards. This book will be an ideal read for ergonomists and engineers engaged in transport and road engineering, transport planners, civil engineers, vehicle designers, and electrical engineers.
Download or read book Code of Federal Regulations Title 49 Transportation Pt 400 571 Revised as of October 1 2009 written by and published by Government Printing Office. This book was released on 2010-02-19 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Code of Federal Regulations Title 49 Transportation PT 400 571 Revised as of October 1 2011 written by U S Office of the Federal Register and published by Government Printing Office. This book was released on 2012-02 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Code of Federal Regulations Title 49 Transportation Pt 400 599 Revised as of October 1 2005 written by and published by Office of the Federal Register. This book was released on 2006-01-17 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
