Sentence:  And yet, they pulsed and glowed and shimmied and flared and stared at you, just like now—staring in at his and Whitey's own lights as they <WSD>blipped</WSD> past on the expressway, just one more set of red and yellow lights streaking along amid a current of red and yellow lights that <WSD>blipped</WSD>, <WSD>blipped</WSD>, <WSD>blipped</WSD> through an unremarkable Sunday dusk. 
Meaning of the word marked with <WSD> tags:  To change state abruptly, such as between off and on or dark and light, sometimes implying motion.