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Hyundai's "E-corner" system
(www.youtube.com)
This is a most excellent place for technology news and articles.
install some derby-style bumpers and they'll know their fancy SUV's gonna get fucked up if they park you in.
People in Boston sometimes have large rubber bumper covers, because according to my uncle "it's apparently just a cultural norm to ram the other people's bumpers to figure out how large the parking spot is"