Yes, your trial will be heard by the magistrates. Careless driving (along with about 99% of other motoring offences) is a �Summary� offence and is dealt with to a conclusion in the magistrates� court, even in the event of a not guilty plea..
The usual sequence of events (and the minimum number of hearings) for a defended matter is:
1. First hearing. Defendant enters plea (not guilty)
2. Pre-Trial review to establish witness availability and to estimate court time needed.
3. Trial
There may be more hearings than this if, say, either side is not ready and seeks an adjournment.