1–19 of 19 hits
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    Minimum In-Service Retroreflectivity of Pavement Markings

    Zwahlen, Helmut T. | Online Contents | 2000
    Contributors: Schnell, Thomas

    Driver-Headlamp Dimensions, Driver Characteristics, and Vehicle and Environmental Factors in Retroreflective Target Visibility Calculations

    Zwahlen, Helmut T. | Online Contents | 1999
    Contributors: Schnell, Thomas

    Evaluation of Two New Crossbuck Designs for Passive Highway-Railroad Grade Crossings

    Zwahlen, Helmut T. | Online Contents | 1999
    Contributors: Schnell, Thomas

      Evaluation of Two New Crossbuck Designs for Passive Highway-Railroad Grade Crossings

      Zwahlen, Helmut T. | Online Contents | 1999
      Contributors: Schnell, Thomas

    Visibility of Road Markings as a Function of Age, Retroreflectivity Under Low-Beam and High-Beam Illumination at Night

    Zwahlen, Helmut T. | Online Contents | 1999
    Contributors: Schnell, Thomas

    Visual Target Detection Models for Civil Twilight and Night Driving Conditions

    Zwahlen, Helmut T. | Online Contents | 1999
    Contributors: Schnell, Thomas

      Visual Target Detection Models for Civil Twilight and Night Driving Conditions

      Zwahlen, Helmut T. | Online Contents | 1999
      Contributors: Schnell, Thomas

    Driver Eye-Scanning Behavior as Function of Pavement Marking Configuration

    Zwahlen, Helmut T. | Online Contents | 1997
    Contributors: Schnell, Thomas

    Legibility of Traffic Sign Text and Symbols

    Zwahlen, Helmut T. | Online Contents | 1999
    Contributors: Schnell, Thomas

      Legibility of Traffic Sign Text and Symbols

      Zwahlen, Helmut T. | Online Contents | 1999
      Contributors: Schnell, Thomas

    Visibility of New Centerline and Edge Line Pavement Markings

    Zwahlen, Helmut T. | Online Contents | 1997
    Contributors: Schnell, Thomas

    Visibility of New Dashed Yellow and White Center Stripes as Function of Material Retroreflectivity

    Zwahlen, Helmut T. | Online Contents | 1996
    Contributors: Schnell, Thomas

    Knowledge-Based Personal Computer Software Package for Applying and Placing Curve Delineation Devices

    Zwahlen, Helmut T. | Online Contents | 1995
    Contributors: Schnell, Thomas

    Loss of Visibility Distance Caused by Automobile Windshields at Night

    Zwahlen, Helmut T. | Online Contents | 1995
    Contributors: Schnell, Thomas

    Visibility of New Pavement Markings at Night Under Low-Beam Illumination

    Zwahlen, Helmut T. | Online Contents | 1995
    Contributors: Schnell, Thomas

    Viewing Ground-Mounted Diagrammatic Guide Signs Before Entrance Ramps at Night: Driver Eye Scanning Behavior

    Zwahlen, Helmut T. | Online Contents | 2003
    Contributors: Schnell, Thomas

    Recognition Distances of Different Pavement Arrow Designs During Daytime and Nighttime

    Zwahlen, Helmut T. | Online Contents | 1999
    Contributors: Schnell, Thomas

      Recognition Distances of Different Pavement Arrow Designs During Daytime and Nighttime

      Zwahlen, Helmut T. | Online Contents | 1999
      Contributors: Schnell, Thomas

    Visibility of New Yellow Center Stripes as a Function of Obliteration

    Zwahlen, Helmut T. | Online Contents | 1995
    Contributors: Schnell, Thomas

    Review of Legibility Relationships Within the Context of Textual Information Presentation

    Zwahlen, Helmut T. | Online Contents | 1995
    Contributors: Schnell, Thomas

    Effectiveness of Ground-Mounted Diagrammatic Advance Guide Signs for Freeway Entrance Ramps

    Zwahlen, Helmut T. | Online Contents | 2003
    Contributors: Schnell, Thomas