You may have been guilty of failure to yield as crossing traffic would have had the right of way and the cop might be trying to say you should have waited for him to pass but it's hard to tell from your description of the event. Be aware that the cop or the judge may try to amend the charge at some point. For right now, the proper thing to do is respond with TBD. I wouldn't mess with discovery as that might inspire the officer to take another look at things and try to amend before arraignment or trial.

