Task: Question Answering
Input (English): Context: One I fixed , without fully dismounting , which was nice . The other I recognized was beyond me ; it was n't anything criminal , just a hazard . Maybe I should have called that one in to the police , but the police left me confused tonight , so , I ' m going to keep to myself for the moment . On my way back home again , a cruiser pulled up just past me , a lane to my right , and turned on its red - and - blues , twittering the siren a few times . 
Question: What may be the reason for the police to twitter the siren ?
Output (English): To get people out of their way .