It's so endemic that plea bargaining is a part of the official process for minor traffic violations. I used to get a lot of speeding tickets and I would always take them to court, because the solicitor would always negotiate just prior to the trail. It usually saves you some money if you do this (depends on the jurisdiction) The process was almost always for the DA or solicitor to recommend you plea guilty or no contest. If you plead guilty, you would not see the judge and you'd get a reduced sentence (typically increased fine, but no points on your license). No contest would have different rules depending on the court, but would also end up better for you in the long run most times.
The one time I please innocent (I truly felt I was), I ended up with 6 months probation, 2x the fine, and double the points on my license. In the end, the cost was well over double what I would have paid if I had just not contested and dealt with the solicitor. The judge even commented during the proceedings how taking such a simple case of speeding in front of the court wastes everyone's time and I should have been ashamed.
BTW, I was contesting the case, because there was no speed limit sign posted where I was pulled over. Evidently there had been construction completed recently which changed the number of lanes and intersections. This caused the county to reduce the speed limit, but they failed to install a new sign. The old one was removed during the construction.
That sign was never installed. It only got fixed after additional changes were made several years later.