You do, however, have the constitutional right to do so. I would recommend spending an entire day in the court to observe how judges handle self-represented defendants to get an idea of how irritated they get at amateur lawyering.
If you really want to represent yourself, you should purchase an hour of a traffic attorney's time to have her or him coach you on how to handle things.
A better choice if you do not want to pay the fine is simply to hire an attorney.
You might find my Legal Guide helpful "How to Choose A Lawyer For You"
Check with a lawyer in your locale to discuss more of the details.
Good luck to you.
NOTE: This observation is made available by the out-of-state lawyer for educational purposes only. This observation is not like a communication with a lawyer with whom you have an attorney-client relationship along with all the privileges that relationship provides.