Current published standards for vehicular and pedestrian traffic control signal heads which are issued by the Institute of Traffic Engineers (ITE) do not contain provisions for use of the more accurate instrumental test methods or for fully evaluating the chromaticity of the thermoplastic lens materials. The present standards are based upon the use of certified limit filters, for determination of chromaticity and transmittance. Certified limit filters are no longer available for purchase from the National Bureau of Standards. Procedures for the calibration of both limit and reference filters are contained in this report along with historical and spectral transmittance data on the limit glasses which were used as the basis of the present standards. The report proposes the instrumental measurement of chromaticity to be the specified test method, and that color 'calibration' filters of the material being tested be used to calibrate the colorimeter rather than limit filters. This report further proposes elimination of lens transmittance requirements to be replaced with luminous intensity requirements for each vehicular signal type and color and luminance requirements for pedestrian signals. Revisions are proposed for the ITE standards to accomplish these changes.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Development of Standards and Tests for Acceptance of Traffic Signal Lenses


    Beteiligte:
    D. F. King (Autor:in)

    Erscheinungsdatum :

    1977


    Format / Umfang :

    116 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Acceptance standards

    Engineering Index Backfile | 1946


    Gap-acceptance modelling by traffic signal analogy

    Akçelik, R. | Online Contents | 1994


    Acceptance tests

    Jaroschek, K. | Engineering Index Backfile | 1930


    Acceptance standards for castings

    Ball, L.W. | Engineering Index Backfile | 1946


    Group standards and vehicle acceptance

    Sutton, A. / Institution of Mechanical Engineers; Railway Division | British Library Conference Proceedings | 1998