French road operator APRR (Autoroute-Paris-Rhin-Rhône) has opted to replace obsolete sodium lamps with LED lighting in the 3.3km Chamoise Tunnel. The LEDs have four times the lifespan of high pressure sodium bulbs and are expected to cut energy use by 45 per cent, or some or 400,000kWh. Moreoever, APRR says the LED units also make lighting more uniform and colours are truer to their normal values, which helps drivers and the cameras that record incidents. Each tube of the tunnel will have 600 LED lamps, cos
