Ads for carriers with a car coming at you? No, I got it... have the sign pop out of the road on the outside of a curve and flash a super bright strobe light and 220 dB sonic blast,,,
... And instead of an E-Z pass, make it so drivers have to wear a hat with a "drinky bird" that pokes you in the eye, leaks, and asks you about the rule against perpetuities... Yeah!
(note: Originally the T9 on my cell phone made the last word "Wei?" Which, is also pretty funny.