Buuxi weedha soo socota: Wadooyinka soo gala waxaa si tartiib tartiib ah loo hagaajiyay, dhawaana waxaa la kordhiyay dhinacyada koonfureed. Hoolka Mont Blanc
masiibada 1999 waxay keentay in dib loo eego ammaanka tunnel wadada ee dalal badan oo ay ku jirto Switzerland, iyo horumarinta ammaanka muhiim ah ayaa la qorsheeyay Grand St Bernard Tunnel. Xaddiga xawaaraha ee 80 km/h (50 mph) ayaa durba lagu dhaqmaa gudaha tunnel.