Warning: Stop Ahead. Below is a video of a Flashing LED Stop Ahead Sign located in Georgia.
This particular sign is AC powered and is located on a curve to alert drivers that they need to stop around the bend.
Therefore, this sign is made to be durable in any and all weather conditions. Along with the other signs, these are made with highway grade .080 aluminum construction provides resistance to corrosion. Then they use stainless steel security fasteners and Tufnut mounting hardware included to keep the sign secure.
The video below depicts the sign being shown in Georgia at a curve in the road, warning drivers of a Stop Sign coming up ahead.