(S (S (S (BASENP (JJ Heavy) (NN machinery)) (VP (VBZ is) (ADJP (JJ available)))) (CC but) (S (BASENP (DT the) (NN road) (NNS conditions)) (VP (VBP have) (VP (VBN prevented) (S (BASENP (PRP it)) (VP (VBN arriving) (PP (IN at) (NP (BASENP (DT the) (NNS areas)) (SBAR (WHADVP (WRB where)) (S (BASENP (PRP it)) (VP (VBZ is) (VP (VBN required))))))))))))) (PERIOD .))