Was the notice sent to you certified mail that you had to sign for it? If not, I'd chuck it and claim I never got. If they want to waste their money, they can keep sending notices in hopes to collect their "fine". On a traffic violation with no cop, I'm definitely not paying on first notice.
I did get my photo snapped running thru a PA Turnpike EZ pass lane a couple years ago. I paid that since I was dead to rights on theft of the precious toll road system. $40 + mistake.
Gun Control = Using both hands, and hitting your target