If I’m reading it correctly you’ll be in front of a magistrate so you can enter a plea in person, if you intend to plead guilty I assume the case will be dealt with there and then by a magistrate, it could be postponed but I doubt it would be, if you intend to plead not guilty it could go to crown court.
If you do not attend the magistrates court at the given date and time a warrant for your arrest may be issued, so it’s important that you attend court, if for any reason you cannot attend court on the date mentioned you must let them know in advance, otherwise you could have the hassle of being arrested, you would most likely be bailed but it’s still a pita and worth avoiding if possible.
Driving is your livelihood so my advice would be to see a solicitor and get proper legal advice.