What is the main reason for using a reflective triangle on the road?

The primary purpose of a reflective triangle is to warn other drivers of a stopped vehicle. When a vehicle is disabled or involved in an accident, placing a reflective triangle behind the vehicle alerts approaching motorists to the potential hazard. This warning system is crucial for maintaining roadway safety, as it helps to prevent further accidents by making the stopped vehicle more visible, especially in low-light conditions or in areas with reduced visibility.

While signaling for help, providing road instructions, or indicating a detour are important considerations for road safety and navigation, these are not the main functions of a reflective triangle. The triangle's design and reflective material serve specifically to draw attention to a stationary vehicle, ensuring that other drivers have ample time to react and adjust their driving accordingly.