
Why is the stop signal of the stop and octagonal shape? It has not always been like this
The signal of STOPwhich imposes the arrest in correspondence with the horizontal line and the granting of precedence before entering a crossroads, has a fascinating history that dates back to the early twentieth century. Initially introduced in the United States thanks to the engineer William Phelps Enopioneer of road safety, this sign did not have a uniform color and varied ...








