Final answer:
In an accident, it's recommended to place emergency road flares 100 to 150 feet behind the vehicle, equivalent to about 5 to 10 car lengths, depending on vehicle size and road speed.
Step-by-step explanation:
In an accident, place emergency road flares 100 to 150 feet behind the vehicle to ensure oncoming traffic is alerted in time to adjust their path and slow down safely. The exact distance may vary based on the speed limit and road conditions, but this range is a generally accepted guideline. Regarding car lengths, considering the average car length is approximately 15 to 20 feet, this translates to about 5 to 10 car lengths.
It is crucial to assess the situation and visibility conditions as well; for instance, on a high-speed highway, placing the flares farther back may be more appropriate. Always ensure that flares are visible to other drivers and that you are placing them in a safe manner to avoid any additional hazards.