In July 2006, track construction in the LBT was declared complete. Extensive testing then took place, including more than 1,000 test runs, which focused among other things on the use of the ETCS Level 2 system. Once satisfied that all systems had been validated, an official opening ceremony for the LBT was held during June 2007; at this event, the tunnel was recognised as the longest land tunnel anywhere in the world. The LBT overran its budget of roughly $2.7 billion by around $840 million, which has impacted its operation.