the DNR about the specs of the plate: must be a minimum of 4 inches in height and 7 1/2 inches wide; must be white; black lettering a minimum of 1 1/2 inches high with a minimum 3/16 inch stroke; needs only the 4 registration numbers and two letters that. All Wisconsin recreational safety students are required to obtain a Wisconsin DNR Customer ID Number when registering for a safety education class and must provide. . View all in-person safety courses. Offroad Ed is a vicarious provider for who Wisconsin Department of Natural Resources. com%2fwisconsin%2f/RK=2/RS=gIUHl7s3Ltu5rIU7Ary0ycX7KiU-" referrerpolicy="origin" target="_blank">See full list on offroad-ed.