Techniques and Calculation Methods for Lighting Systems of Underpasses and Road Tunnels in Romania

A good lighting system for underpasses or road tunnels achieves good visibility conditions for road users, where luminance levels are required to match the level of adaptation of the vision of road vehicle drivers. This scientific paper presents the authors' own representation and original point of view on the technical acceptability of lighting in underpasses and tunnels dedicated to road traffic. In this way, those interested can learn about: psychological effects created by light on drivers when entering/exiting to/from underpasses or road tunnels; external factors significantly influencing the methods of realization of lighting systems, lighting motivation, lighting systems calculation, safety lighting, pedestrian evacuation ways, emergency exits, automation of related lighting systems, constructive solutions of dedicated lighting systems and how lighting systems are maintained and serviced, all of them, for underpasses or road tunnels. At the end of the paper, conclusions related to the field are presented.