Road lighting is intended to improve the comfort and safety of road users at night by increasing visibility levels. This purpose is best achieved by ensuring certain luminance levels and uniformities on the pavement. The luminance distribution depends on the photometric properties of both the luminaires and the pavement. Hence, the reflection properties of the road surface must be taken into account when designing a road lighting installation, by means of the bidimensional distribution of reduced luminance coefficients, called the r-table. As these data are difficult to determine, lighting calculations are usually performed using standardized r-tables introduced by the CIE decades ago. But pavement materials have changed since that time, and the question arose whether they could still be applied to current road surfaces. To investigate that question, the French government decided to launch a measurement campaign in order to gather up-to-date data on road surface reflection properties, and to study the impact of this data on lighting design for typical road scenarios. The first part of the study showed that the r-tables standardized by the CIE decades ago are no longer representative of the pavement materials which are found on French roads nowadays. It was shown that this has a direct impact on the lighting design differences in performances were found when using standard instead of measured data, primarily in terms of average luminance value (often up to 30% and sometimes even 50%), secondarily in terms of disability glare (Tl), and in terms of luminance uniformity (related to the knowledge of S1). Like in the cited study, this raises the question of the need of new CIE r-tables that would be more representative of the current materials in use on roadways. It also calls for a more serious evaluation of the real properties of road surface characteristics I not when new but rather after 3 years). Moreover, is it possible to determine an established Situation for the various types of pavement material? The second part of the study showed that it was not negligible to consider the choice of road surface materials with respect to the lighting design in a comprehensive economic approach (equipment, energy consumption and maintenance). The methodology will be developed in a forthcoming research report of CERTUS. Another question raised by this study concerns the evolution in time of the road properties and particularly what to take into account when a lighting installation is required on a new road. A complementary part of the study was planned, considering the visual impact of the various materials. For example, what is the impact on the contrast observed between the marking and the road surface?


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    Titel :

    Comparison of measured and standard r-tables, and impact on road lighting


    Weitere Titelangaben:

    Vergleich von gemessenen und Standard r-Tabellen und der Einfluss auf Straßenbeleuchtung


    Beteiligte:
    Chain, Cyril (Autor:in) / Dumont, Eric (Autor:in) / Legoueix, Gilles (Autor:in) / Lopez, Fabrice (Autor:in) / Paumier, Jean-Luc (Autor:in) / Verny, Paul (Autor:in)


    Erscheinungsdatum :

    2007


    Format / Umfang :

    8 Seiten, 4 Bilder, 2 Tabellen, 9 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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