A couple of years ago I explained here what the PTOE certification is. I have been resisting taking the certification exam because I don't think the certification means a great deal. It means you could pass a 150 question exam where you had to memorize a fair amount of details (when in reality, most of us engineers grab our reference books to look up those details). I don't think it makes a seasoned traffic engineer more qualified to do their work.
This year I heard about one consultant trying to discredit another traffic engineer because they didn't have the PTOE certification. That was the tipping point for me. I make my living preparing traffic studies and representing my clients in front of city council's. It's easier to say I'm a PTOE too instead of trying to explain why the certification doesn't really prove that much.
I signed up for the exam in May. Looked through the refresher course manual. Wrote up about 50 flash cards with equations and standard values to memorize. Showed up in June for the exam and went through the 150 questions in about two and a half hours. Out of the 46 traffic engineers who took the exam in June, I was one of the 33 who passed.
So, in addition to being a licensed Professional Engineer (PE) I am now a PTOE. I guess I'll put that on my business cards when I'm due for a new batch. I don't think I'll raise my billing rate though.