The crossword solutions for the term 'REASON TO PULL OVER' are SIREN and FLAT. A SIREN is a loud noise-making device used by emergency vehicles such as police cars, ambulances, and fire trucks. When a SIREN is heard, it is usually a sign that the vehicle is responding to an emergency and drivers should pull over to the side of the road to allow the vehicle to pass. A FLAT tire is another common reason for a driver to pull over. A FLAT tire can be caused by a variety of things, such as a puncture from a sharp object or a slow leak due to a worn tire. In either case, it is important for the driver to pull over and check the tire before continuing on their journey.