Download or read book Evaluation of Retroreflective Pavement Markers for Precision and Nonprecision Runways written by Guy S. Brown and published by . This book was released on 1982 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Retroreflective Pavement Markers for Precision and Nonprecision Runways written by and published by . This book was released on 1982 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this program was to evaluate the use of retroreflective pavement markers, installed in a configuration duplicating runway centerline and touchdown zone lighting system of a Category II runway on Category I or Nonprecision Approach runways with edge lighting to determine if these retroreflective markers will enhance nighttime visual guidance to provide increased safety of operations and possible reduction in minimums, particularly under wet runway conditions. Visual contact height with the retroreflective pavement marker systems was not enhanced prior to reaching Minimum Descent Altitude (MDA) or Decision Height (DH) for nonprecision or Category I approaches respectively; therefore, this system will not permit the reduction in approach minimums for Category I precision or nonprecision approaches. However, the test program demonstrated that the system is effective in improving the safety of operation for final approach, flare and touchdown, landing rollout, and for takeoffs. Particularly under rainy, wet nighttime conditions, the pavement retroreflector significantly enhanced the visual guidance, supplementing that provided by the standard runway edge lights and paint markings which are difficult to see under wet conditions. (Author).
Download or read book Evaluation of Retroreflective Pavement Markers for Precision and Nonprecision Runways written by Guy S. Brown and published by . This book was released on 1983 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this program was to evaluate the use of retroreflective pavement markers, installed in a configuration duplicating runway centerline and touchdown zone lighting system of a Category II runway on Category I or Nonprecision Approach runways with edge lighting to determine if these retroreflective markers will enhance nighttime visual guidance to provide increased safety of operations and possible reduction in minimums, particularly under wet runway conditions. Visual contact height with the retroreflective pavement marker systems was not enhanced prior to reaching Minimum Descent Altitude (MDA) or Decision Height (DH) for nonprecision or Category I approaches respectively; therefore, this system will not permit the reduction in approach minimums for Category I precision or nonprecision approaches. However, the test program demonstrated that the system is effective in improving the safety of operation for final approach, flare and touchdown, landing rollout, and for takeoffs. Particularly under rainy, wet nighttime conditions, the pavement retroreflector significantly enhanced the visual guidance, supplementing that provided by the standard runway edge lights and paint markings which are difficult to see under wet conditions. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 1278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Performance of Permanent Pavement Markings and Retro Reflectors in Snowplowable Raised Pavement Markers written by Neville A. Parker and published by . This book was released on 2002 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation Findings of the Ecodyn Mobile Pavement Marking Retroreflectometer written by and published by American Society of Civil Engineers. This book was released on 2000 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Retroreflective Airfield Pavement Markings Ellsworth AFB South Dakota and Tyndall AFB Florida written by and published by . This book was released on 1995 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides details on two tests performed to determine if 1.5 Index of Refraction (IOR) glass beads are suitable retroreflective material for USA airfield markings. The tests were done at Ellsworth AFB SD from 25 Sep 91 through 9 Jun 92 and at Tyndall AFB FL from 12 Dec 93 through 24 March 95. During the first phase of the project, two taxiway centerline stripes, separated by a six-inch gap were applied on the primary aircraft taxi route at Ellsworth AFB SD. Each was reflectorized with glass beads applied at approximately the same rate, but one was reflectorized using Federal Specification TT-B-l325B, Type 1(1.5 IOR) beads and the other with Type III(1.9 IOR) beads. The test stripes were evaluated by 91 pilots and civil engineer personnel for approximately nine months through visual comparison and measurement of the retroreflective intensities of the two lines. The empirical data demonstrates the 1.5 IOR beads were more durable than were the 1.9 IOR beads. The pilots' evaluations showed that 1.5 IOR beads are suitable for airfield apron and taxiway markings. During the second phase of the project, the primary runway at Tyndall AFB FL was marked, again using the two different types of glass beads; however, these were procured under Federal Specification TT-B-1325C, an updated version modified to improve the performance of the Type III beads. The pavement markings applied on the north side of the runway centerline were reflectorized with Type I glass beads, and Type III glass beads were used 10 reflectorize the markings on the south side of the runway centerline. The test stripes were evaluated by 35 pilots and civil engineer personnel for approximately 15 months through visual comparison and measurement of the retroreflective intensities of the two lines.
Download or read book Evaluation of Pavement Markings for Improved Visibility During Wet Night Conditions written by Benjamin H. Cottrell and published by . This book was released on 1996 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the night visibility of waffle tape and paint with large beads, particularly during wet night conditions. Data were collected at two sites along a primary arterial. The evaluation included an examination of (1) the application of the markings, (2) the visibility of the markings using retroreflectometer measurements and subjective assessments, and (3) the costeffectiveness of the markings. The study revealed: (1) compared with paint with standard beads, the waffle tape and paint with large beads were slightly more retroreflective during light rain at night and recovered quicker after flooding out, (2) the marginal improvement in visibility during periods of light rain do not offset the operational problems of applying paint with large beads, and (3) the benefits of waffle tape during light rain do not appear to justify its use solely for wet night visibility. Because of the above findings, snowplowable raised pavement markers, which are very visible in wet night conditions, appear to be more cost-effective. The study recommends that (1) VDOT continue to use and maimain snowplowable raised pavement markers for visibility during wet night conditions, (2) VDOT continue to monitor FHWA's study on all weather pavement markings, and (3) the Suffolk District consider testing nonsnowplowable raised pavement markers to assess their use as a low-cost alternative to improve visibility during wet night conditions where snowplowing occurs infrequently.
Download or read book NASA SP written by and published by . This book was released on 1985 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Pavement Marking Practices written by James Migletz and published by Transportation Research Board. This book was released on 2002 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 306: Long-Term Pavement Marking Practices documents the current and best practices for managing pavement marking systems, identifies future needs, and addresses driver needs and methods of communicating information to drivers, selection criteria (e.g., reflectivity, pavement service life, wet weather performance), materials (e.g., color, durability, cost), specifications, construction practices, inventory management systems, and more.
Download or read book Transportation Weekly Government Abstracts written by and published by . This book was released on 1983 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Predicting the Initial Retroreflectivity of Pavement Markings from Glass Bead Quality written by Omar Smadi and published by Transportation Research Board. This book was released on 2013 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes a laboratory test method to predict the initial retroreflectivity of pavement markings in the field based on the quality of the applied glass beads.
Download or read book Select List of Airport related Research Development Reports 1972 1987 written by and published by . This book was released on 1987 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Retro reflective Beads in Airport Pavement Markings written by Keith W. Bagot and published by . This book was released on 1994 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation Findings of the Laserlux Mobile Pavement Marking Retroreflectometer written by and published by American Society of Civil Engineers. This book was released on 2000-01-01 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safety Evaluation of Permanent Raised Pavement Markers written by Geni Brafman Bahar and published by Transportation Research Board. This book was released on 2004 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 518: Safety Evaluation of Permanent Raised Pavement Markers examines the safety performance of snowplowable permanent raised pavement markers on two-lane roadways and four-lane freeways"--Publisher's description.
Download or read book Select List of Airport related Research Development Reports 1972 1984 written by Fred Horn and published by . This book was released on 1984 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
