Läsbarhet och synbarhet av vägmärken med reflexfolie: ett fältexperiment i mörker samt enkätstudier

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Background: Road signs are crucial for informing road users and need to be bright enough to be visible and readable, but not so bright that they cause glare. The brightness levels of road signs should also be appropriate for the vast majority of road users.

Purpose: The purpose was to evaluate readability of road signs of retroreflection classes RA2 and RA3B, with regard to factors affecting the retroreflection per se, amount of light onto the signs, and how well the driver sees. Objective measures of reading distance and visual status, and subjective measures of how different categories of drivers experience that they detect, read, and experience glare from road signs were also to be taken into account.

Methods: A field experiment measured reading distance (and visual acuity and contrast); and questionnaire studies measured opinions and experiences from different driver categories concerning driving in darkness in general, and about properties of road signs in darkness in particular.

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