Mobil mätning av vägbelysning

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Sven-Olof Lundkvist
Stig Englundh

For most types of road equipment there are regulations that set the performance requirements. For example, a road marking must have a minimum retroreflectivity for it to have sufficient visibility. Regarding road lighting there are multiple performance requirements in the Swedish Transport Administration's requirements for road and street design (VGU), including requirements for allowed glare, demands on shielding, illuminance and road surface luminance. On most roads and streets, the luminance requirement is the most important parameter, not least because this is important for the possibility of detecting pedestrians.

For a requirement in the regulations to be meaningful, it is important that it is possible to check if the requirements are met. However, luminance measurements are complicated and susceptible to interference from ambient light sources.

The purpose of this study was to develop a prototype of an instrument which enables fast mobile measurements of road surface luminance without the risk of interference from other traffic.

Completed tests with the instrument have shown that the measurement of road surface luminance on longer sections can be performed, without light interference from other traffic. The measurements are also relatively rapid and requires a minimum of manual data processing. The measurement system additionally has good accuracy which makes it suitable for condition assessment of road lighting.

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