Keep an eye out next time you see a ping in an illegal area, and check to see if its under $2500. Like DK said I don't think I've ever seen any under $2500 but it's possible. Let me know if it does ping for under $2.5k
I personally dislike the speeding charges because it clutters the wanted list, it gives an OCD numbered bounty, and overall doesn't add anything other than inconvenience to civ and APD, it barely adds role play.