Given how much I dislike toll roads, I hate to say this. But you're probably right in paying the fine, Bob.
A few years ago, I went back to my college alma mater to do interviews for a company where I was working. I got a $10 parking ticket on the university lot. I blew it off. Before I knew it , I got a notice in the mail stating that a warrant had been issued for my arrest in the state of Pennsylvania. It seems the school had turned the ticket over to the local township police. I ignored their warnings and late fees, and that was the result. In the end, I paid the new hefty fee, since I regularly visit relatives in PA, and didn't want to risk getting pulled over.