( Similarly ( , ( ( ( traffic ( flow improvements ) ) ( that ( ( improve ( air quality ) ) ( through ( ( operational improvements ) ( of ( the ( road system ) ) ) ) ) ) ) ) ( ( would ( be ( managed ( by FHWA ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Similarly)) (, ,) (NP (NP (NN traffic) (NN flow) (NNS improvements)) (SBAR (WHNP (WDT that)) (S (VP (VB improve) (NP (NN air) (NN quality)) (PP (IN through) (NP (NP (JJ operational) (NNS improvements)) (PP (IN of) (NP (DT the) (NN road) (NN system))))))))) (VP (MD would) (VP (VB be) (VP (VBN managed) (PP (IN by) (NP (NNP FHWA)))))) (. .)))
Similarly, traffic flow improvements that improve air quality through operational improvements of the road system would be managed by FHWA.
(ROOT (S (S (VP (VBG Limiting) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS cars)) (PP (IN on) (NP (DT the) (NNS roads)))))))) (VP (MD would) (ADVP (RBS most) (RB likely)) (VP (VB improve) (NP (DT the) (NN air) (NN quality)) (PP (IN in) (NP (JJ large) (NNS texas) (NNS cities))))) (. .)))