the roadway construction; renewal of cladding panels; repair, while maintaining the traffic flow. The total construction costs amounted to approximately CHF 236 million (approximately 148 million euros). The Mont Blanc tunnel fire between France and Italy in 1999 triggered a general safety review of road tunnels in several countries, including Switzerland. In September 2007, the San Bernardino Tunnel saw the completion of a major safety upgrade. Lighting has been increased and become more evenly diffused, with a corresponding improvement in visibility. Particular care has been taken with the visibility of access points to the reworked escape tunnel, minimizing the risk of escape routes becoming obscured by smoke in the event of a major conflagration. References External links Tunnels in Graubünden Transport in Graubünden Tunnels completed in 1967 Road tunnels in Switzerland Tunnels in the Alps de:San-Bernardino-Pass#San-Bernardino-Tunnel