Final answer:
You must stay at least 150 meters away from a fire truck in emergency mode to ensure the truck can operate effectively and to maintain road safety.
Step-by-step explanation:
When following a fire truck, it's imperative for safety reasons that you maintain a sufficient distance behind the emergency vehicle. This rule ensures that the fire truck can proceed to its destination without obstruction and that you have enough time to react to any sudden stops or turns the fire truck might make. While the information provided does not directly give the required distance, as a general rule of thumb and in accordance with the guidelines set forth by most traffic authorities, you must stay at least 150 meters (500 feet) from a fire truck that's in emergency mode. This allows the fire truck to operate effectively and ensures road safety for you and other drivers.