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- W652843033 abstract "This report investigates the effect of porous road surfaces in reducing the visibility impediment caused by thrown up water and in particular aims to demonstrate this by means of a film recording. Details are given of the equipment and measuring and evaluation procedure. The test sections were on a motorway open to normal traffic and included coarse dense asphaltic concrete, open asphaltic concrete, very open asphaltic concrete and a further coarse dense asphaltic concrete. Details are given of the filming equipment and procedure. The films were watched by 12 assessors 4m from the screen and their assessments of visus values and just perceivable light intensities recorded. The results are analysed and their significance discussed. Problems in individual perception and film quality are also considered. The concept of contrast weakening is examined and a formula derived. The intensity of rain is found to have a greater effect on visibility than the surfacing material. Ordinary rear lights are found to be often hardly perceivable but braking lights are visible up to 100m. The most critical effect of thrown up water is to render invisible objects of low contrast such as road markings and in this situation the very open surface presents a darker background. This report was originally published in Dutch by the Institut voor Zintuigfysiologie (TNO) as Report No IZF 1977-C17." @default.
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- W652843033 date "1990-03-01" @default.
- W652843033 modified "2023-09-26" @default.
- W652843033 title "THE INFLUENCE OF BITUMINOUS ROAD SURFACES ON A CAR DRIVER'S VISIBILITY DURING RAINFALL" @default.
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