If you know you're going to be late, call your lawyer, not the court. If you've already missed the date you'll probably have an outstanding bench warrant for your arrest. It's possible to get the warrant quashed with the help of a lawyer. Otherwise you're at risk of being pulled over for a traffic violation and going to jail as a result. Don't let this happen, be vigilant about making court appearances. Get there early and bring a book. Anytime you go to court it's likely that you'll be doing a lot of waiting around.
You can be charged with additional crimes for failing to appear in court. Even missing one appearance can result in a new criminal charge called "Bail Jumping", even if you beat the charge that brought you into court in the first place! Don't let that happen to you, consult with a lawyer as soon as you can after missing a court date.
For more information regarding your question, contact a criminal defense lawyer at Perez & Perez Law, PLLC.