The control of flicker effect as pivotal element for the luminance of Transport Tunnels and Continuous Transportation Infrastructures (VLUR)

The majority of endeavors in search of tunnel illumination have been centered on the design and execution of precise lighting fixtures in the liminal areas with the objective of reducing the harmful effects of the delayed adaptation of visibility during day-lit periods, while maintaining a moderate use of energy. Nevertheless, few researchers have concentrated on the internal areas of the tunnels whose surplus of longitude may represent a significant fraction of the total infrastructure. Within such areas, for instance, the flicker effects may be made more manifest. Such fact usually becomes a severe nuisance for the users and the authors consider that some strategies to overcome it, need to be developed. In this paper we would explain why such prejudicial situation had been reached and based on the former, how to advance some design solutions and details to improve the main drawbacks. In summary, we will try to prove that the use of direct solar radiation is an effective tool to countermeasure the dangerous outcome of flickering.