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

    Zwahlen, Helmut T. / Schnell, Thomas | Transportation Research Record | 2019

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

    Zwahlen, Helmut T. / Russ, Andrew / Schnell, Thomas | Transportation Research Record | 2003

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

    Zwahlen, Helmut T. / Russ, Andrew / Roth, James M. et al. | Transportation Research Record | 2003

    Minimum In-Service Retroreflectivity of Pavement Markings

    Zwahlen, Helmut T. / Schnell, Thomas | Transportation Research Record | 2000

    Computer-Based Modeling to Determine the Visibility and Minimum Retroreflectivity of Pavement Markings

    Schnell, Thomas / Zwahlen, Helmut T. | Transportation Research Record | 2000

    Legibility of Traffic Sign Text and Symbols

    Zwahlen, Helmut T. / Schnell, Thomas | Transportation Research Record | 1999

    Visual Target Detection Models for Civil Twilight and Night Driving Conditions

    Zwahlen, Helmut T. / Schnell, Thomas | Transportation Research Record | 1999