What is the purpose of a speed limit sign?

A speed limit sign serves to indicate the maximum speed you are legally permitted to drive on a particular stretch of road. These signs are crucial for promoting safety and controlling traffic flow, as they help inform drivers about the maximum speed that is safe for the conditions of the roadway.

When a speed limit is posted, it is based on factors such as road design, traffic patterns, and environmental conditions, ensuring that drivers can navigate safely while minimizing the risk of accidents. It is important for drivers to adhere to these limits, as driving above the posted speed can lead to legal consequences and increase the risk of collisions.

The other choices suggest alternate functions that do not accurately represent the primary role of speed limit signs. They are not merely suggestions or warnings but definitive limits that enforce legal speed regulations.