The secret is, probably no one cares. Some places like NYC have cops out ticketing cyclists (and everyone else) in a harassing sort of way. If your town is like that, they might get you for it, but only because they were going to get you for something. My city and county will only do you for speeding on a bike trail and enforcement is like a few weekends a year. This is the kind of law that will only be enforced on you if you cause a big loss that draws the police and inspires them to throw the book at you. There are lots of laws on the books like this... the stretchy dog leashes we all like to complain about are illegal here, the law requires a <6ft lead, but they're still for sale and widely used. No one is getting cited unless their dog bites a face off. A driver who buzzes a cyclist <3ft is going to be ignored unless he buzzes the cyclist <0ft and then gets caught.
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Genesis 49:16-17