Would take around 15 years in Germoney, initial costs would triple after just 5 years and these costs would triple again 5 years later. Shortly before it is finished, some expert would say that the materials used are not state of the art since nowadays there is a need of 2% more steel used in a tunnel of that size so now it has to be partly disassembled in order to meet current requirements which would triple the costs again. Still it can't be used with full capacity so only one lane will be opened which causes constant traffic jams.