(S (S (S (BASENP (NNS Drivers)) (VP (ADVP (RB also)) (VP (VBD ran) (PP (IN into) (NP (BASENP (NNS problems)) (PP (IN on) (BASENP (JJ major) (NNS highways)))))))) (SBAR (IN as) (S (BASENP (NNS accidents)) (VP (VP (VBD were) (ADJP (JJ unavoidable))) (PP (IN on) (BASENP (DT the) (NN slick) (NNS roads))))))) (PERIOD .))