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Sustainability 2015, 7(7), 9664-9680;

Energy Optimization of Road Tunnel Lighting Systems

DIAEE—Area Fisica Tecnica, Università degli Studi di Roma "Sapienza", Via Eudossiana, 18, 00184 Rome, Italy
DIMI—Università degli Studi "Roma TRE", Via Vito Volterra, 62, 00146 Rome, Italy
Author to whom correspondence should be addressed.
Academic Editors: Francesco Asdrubali and Pietro Buzzini
Received: 28 May 2015 / Revised: 8 July 2015 / Accepted: 14 July 2015 / Published: 17 July 2015
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A road tunnel is an enclosed and covered infrastructure for the vehicular traffic. Its lighting system provides 24 h of artificial sources only, with a higher amount of electric power used during the day. Due to safety reasons, when there is natural lighting outside the tunnel, the lighting levels in the stretches right after the entrance and before the exit must be high, in order to guide the driver’s eye towards the middle of the tunnel where the luminance must guarantee safe driving, avoid any over-dimensioning of the lighting systems, and produce energy savings. Such effects can be reached not only through the technological advances in the field of artificial lighting sources with high luminous efficiency, but also through new materials for road paving characterized by a higher reflection coefficient than other ordinary asphalts. This case study examines different technical scenarios, analyzing and comparing possible energy and economic savings. Traditional solutions are thus compared with scenarios suggesting the solutions previously mentioned. Special asphalts are interesting from an economic point of view, whereas the high costs of LED sources nowadays represent an obstacle for their implementation. View Full-Text
Keywords: road tunnel; lighting systems; LED; special asphalts; energy optimization; amortization costs road tunnel; lighting systems; LED; special asphalts; energy optimization; amortization costs

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Salata, F.; Golasi, I.; Bovenzi, S.; Vollaro, E.L.; Pagliaro, F.; Cellucci, L.; Coppi, M.; Gugliermetti, F.; Vollaro, A.L. Energy Optimization of Road Tunnel Lighting Systems. Sustainability 2015, 7, 9664-9680.

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