I'm Doug, and I'm very sorry to hear of your son's situation. My goal is to provide you with excellent service today.
While it is a great idea to get the contrasting photos of the onramps in the area to show that this onramp was confusing and did not allow your son to choose the correct lane to enter onto the freeway, thereby placing him in the dilemma he was presented with.
However, as your son is an adult, the court will not allow you to speak on his behalf. He will be able to use the photos in his defense though.
You don't say whether this is the first court date for this citation
. If it is, he will be asked whether he wants to plead guilty or not guilty. If he wants a trial so that he can put on a defense, then he will need to plead not guilty and a trial date will be set for him in the future.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2015,