What should be the priority when checking for clear side streets before making a right turn?

Answer: B — Checking for incoming traffic

The priority when checking for clear side streets before making a right turn should be to check for incoming traffic. This is crucial because ensuring that the roadway is clear of vehicles approaching from the left helps prevent collisions. During a right turn, the apparatus driver needs to be especially aware of vehicles that may be coming from the opposite direction, which has the right of way in many traffic situations. Attention to incoming traffic allows the driver to assess the safety of proceeding with the turn. This also includes recognizing the speed and proximity of other vehicles, ensuring the driver can safely complete the maneuver without causing disruption or danger. While checking for parked vehicles, pedestrians, cyclists, and emergency signals is important for overall awareness and safety, the immediate concern during a right turn is confirming that there are no oncoming vehicles that could pose an immediate threat.