What does an "S" shape in road signs indicate?

An "S" shape in road signs indicates a winding road ahead. This specific configuration, resembling the letter "S," signifies to drivers that the road will curve and change direction multiple times, requiring them to adjust their speed and maintain heightened awareness. Such a sign alerts drivers to the potential need for caution as they navigate through these turns, making it essential for safety on roads that may have twists and turns.

Drivers should also consider that sharp turns can appear in winding roads, but the primary indication of the "S" shape is the continuation of curves rather than a single, sharp turn. Road closures or hills do not typically involve an "S" sign, as they are represented by different symbols that clearly convey their specific messages to ensure clarity on the roadway.