Sentence:  Willow Run , General Electric 's enormous installations at Louisville and Syracuse , the Pentagon , Boeing in Seattle , Douglas and Lockheed in Los Angeles , the new <WSD>automobile</WSD> assembly plants everywhere - none of these is substantially served by any sort of conventional mass rapid transit . 
Meaning of the word marked with <WSD> tags:  a motor vehicle with four wheels; usually propelled by an internal combustion engine