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Not particularly. The Zodiac Killer's biggest priority seemed to draw his arcane symbol on the map - not figured out until years had passed - and to taunt the media & populace with rambling printed rants. Getting up close was a means to his end, but mostly he just shot them (like the taxi driver, who had to be where he was at to complete the map symbol).

Just killed them, I should've typed. The Zodiac Killer was rather out there, however, so it's hard to figure exactly what he was thinking. They also much later connected him to a killing from years earlier where he left a watch that had been stopped with the hands in the same orientation as the geographic layout of his murders (I don't recall now how they were tied). Was strange b/c if the connection is accurate then he either planned the killing spree years in advance or alternately patterned it for whatever reason after the killing of the college girl with which the watch was left. That's one theory, anyhow (about the earlier connection), which I think makes more sense than the others I've read.