Hire a traffic law attorney who practices in the city or county where you received the ticket.
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If you do not remember the incident then it is not his word against yours anymore, just his. Consult with a local traffic attorney to give them the long story and see what they recommend.
The information provided is not intended as legal advice and does not establish an attorney client relationship. If you are in the greater Sacramento area and wish a further consultation please contact me at (916)594-9442.
Of course you should request a hearing. This is a moving violation. Depending on your driving record, any competent attorney can either have this ticket dismissed or reduced to 3111(a), which yields no points.