Which signal would indicate to stop and remain stopped?

A red light is the universal signal indicating that vehicles must stop and remain stopped unless otherwise directed by law enforcement or specific signage. This signal is critical for managing traffic flow and ensuring safety at intersections. When a driver sees a red light, it means they must come to a complete stop behind the stop line, crosswalk, or intersection until the light changes.

In contrast, a steady green light indicates that it is safe to proceed, and drivers can continue through the intersection. A flashing amber light serves as a warning that drivers should slow down and prepare to stop, but it does not require an immediate stop. A green arrow provides a protected turn signal, allowing drivers to continue moving in the direction the arrow points while remaining clear of opposing traffic. Thus, the red light is the signal that distinctly communicates the need to stop and wait.