As of recently, new state law says if a municipality mails a ticket, you have been served and must pay or appear. You don't have to recieve it, they just have to mail it. Pretty clever right?
Sort of like with Randy Weaver where his mailed summons to appear had the incorrect date and the court ruled that the incorrect date was no excuse for him not showing up to court on the correct date.
AND one must affirmatively prove one is not guilty ... the NEW Democrat constitutionality in colorado as passed by the Democrat legislature if/until challenged as unconstitutional ...