Final answer:
When unable to lane change away from an incident or parked emergency vehicle, one should slow down and proceed with caution, prioritizing safety and being prepared to stop if necessary.
Step-by-step explanation:
If you are unable to lane change away from an incident or a parked emergency vehicle, the appropriate action to take is to slow down and proceed with caution. You should not continue driving at the same speed, honk your horn unnecessarily, or change lanes abruptly as these actions could potentially escalate the situation or create additional hazards on the road.
Emergency vehicles and incidents on the road require all drivers to be attentive and to adjust their driving behavior accordingly. Safety protocols dictate that slowing down and being prepared to stop if needed is the best course of action. This shows respect for emergency responders and consideration for the safety of all road users.