I used to have a set on a car a while back, I had a set of blue. I didn't have too much trouble with the police in GA, but if I went across the border to Florida they didn't like it. They didn't cause me much trouble, but you'll only get a fairly short lifespan out of them.
It's only a matter of time before either the weather or road conditions takes one of the tubes out. You look like a larger 'tard with one tube out than with all going. I replaced and switched to purple later, but eventually had the same problem with one of them going out on me.
If I had it to do over, I'd go with something more high end. If you really have to have something with neon do something indirect and subtle.
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