(S (S (NP (BASENP (DT The) (NNP Trans-Canada) (NNP Highway)) (CC and) (NP (BASENP (JJS most) (JJ other) (NNS roads)) (PP (IN through) (BASENP (DT the) (NNS mountains))))) (VP (VBD were) (VP (VBN closed) (PP (JJ due) (PP (TO to) (NP (BASENP (ADJP (JJ heavy) (CC and) (JJ sudden)) (NN snow) (NNS accumulations)) (SBAR (WHNP (WDT which)) (S (VP (VBD created) (BASENP (JJ severe) (NN avalanche) (NNS hazards))))))))))) (PERIOD .))