What does a sign showing a 10% symbol on a black triangle signify?

The sign displaying a 10% symbol on a black triangle indicates "Steep Hill Downwards." This warning informs drivers of a significant decline in the road ahead, with a gradient of 10%. Understanding this sign is crucial for safe driving, as a steep downhill slope can affect vehicle control, especially for larger vehicles or those heavily loaded. Drivers should reduce their speed when descending to prevent loss of control and to ensure a safe journey.

A steep incline also warrants caution in the opposite direction; however, the specific marking of a downward gradient alerts drivers to the particular challenges associated with descending a hill, as opposed to climbing one or other roadway conditions. Proper awareness of such signs allows for better preparation and response to changes in road dynamics.