"(a) Each person who operates a commercial motor vehicle, who has a commercial driver's license issued by a State or jurisdiction, and who is convicted of violating, in any type of motor vehicle, a State or local law relating to motor vehicle traffic control (other than a parking violation) in a State or jurisdiction other than the one which issued his/her license, shall notify an official designated by the State or jurisdiction which issued such license, of such conviction. The notification must be made within 30 days after the date that the person has been convicted.
(b) Each person who operates a commercial motor vehicle, who has a commercial driver's license issued by a State or jurisdiction, and who is convicted of violating, in any type of motor vehicle, a State or local law relating to motor vehicle traffic control (other than a parking violation), shall notify his/her current employer of such conviction. The notification must be made within 30 days after the date that the person has been convicted. If the driver is not currently employed, he/she must notify the State or jurisdiction which issued the license according to §383.31(a)."
Source:
http://www.fmcsa.dot.gov/rules-regulations/administration/fmcsr/fmcsrruletext.aspx?reg=383.31
How is the ticket worded? Does it say speeding? In my state tickets with no points are given a generic non moving violation title.
That said, I would have a hard time keeping a straight face if a cop gave me a ticket for 4mph over. We had local PD get disbanded a few years ago because all they did was sit on one stretch of road issuing tickets for driving five over the speed limit. It does nothing to increase road safety it just increases funding for the locality. My buddies who are cops say they don't bother writing tickets for less the 10mph over unless its a school or construction zone.