Sure does. Why'd you hit the poor guy with your car, @R00T? That's not being best.
No I didn’t hit him someone else did! I stopped to make sure he was okay!
You may get called by the police during a follow up and asked to write a witness statement. You could get asked to testify if the case goes to trial. They would have to get a subpoena to force you to testify. That is a court order and refusing it can result in fines or jail time if you don't comply. The victim's lawyer may contact you as part of a civil suit against the driver as well.
Then you testify. Jail isn't very common for not complying with a subpoena. You'd have to get sanctioned for contempt of court and a fine is more likely. This isn't some kind of big case or anything. Bradley Manning was imprisoned for contempt of court when he refused to testify at a grand jury regarding Wikileaks for isntance. There are alternatives like getting deposed for your testimony instead of doing it in court. Court is a pain in the ass, but it isn't like this is a high profile crime with a trial that will take weeks or anything.
