Prosecutor's job is to secure convictions even if that means plea-bargaining with a reduced charge, you will most likely be offered
http://www.e-laws.gov.on.ca/html/statutes/english/elaws_statutes_90h08_e.htm#BK227
HTA S. 148 (5) Fail to turn out to left to avoid collision - 2 demerit points + $110 fine
In court the Prosecutor needs the witness' testimony to secure the Careless charge; so if you're looking to get the charge dropped, the First-Attendance meeting will most likely end with the prosecutor scheduling a trial date
The Prosecutor would need to hear the other driver's side of the story, if it puts him at-fault the prosecutor would withdraw the charge and if it is within 6 month statue of limitations... prosecutor might charge the other driver with Careless Driving