Write a continuation for this paragraph - Kua āta whakapai ake ngā rori whakatata, ā, i tata nei, kua whakawhānuihia ngā taupoki hukarere i te taha ki te tonga. Ko te aitua o te pourewa o Mont Blanc i te tau 1999
i whakaoho i te arotake nui o te haumaru o te rori rori i roto i nga whenua maha, tae atu ki Switzerland, me te whakahoutanga haumaru nui e whakamaherehia ana mo te Grand St Bernard Tunnel. Kua mana kē te here tere o te 80 km/h (50 mph) i roto i te awa.