Final answer:
You must not run toward the ambulance at an accident scene as it can hinder emergency responders. Stay clear to allow them to work effectively.
Step-by-step explanation:
One thing you must NOT do at an accident scene is run toward the ambulance. This can create additional chaos and possibly interfere with the emergency responders' efforts to provide aid. Instead, it is important to stay clear of the path of emergency vehicles and allow professionals to do their job efficiently. In any emergency situation, including fire rescue operations and when in a science lab, it's vital to adhere to safety protocols and avoid actions that could exacerbate the situation or put oneself or others in danger.