Warning signs

Some of the first roadside signs —ancient milestones— merely gave distance measures. Hazard warnings were rare though occasional specimens appeared, such as the specific warning about horse-drawn vehicles backing up which was carved in stone in Lisbon's Alfama neighborhood in 1686. The early signs did not have high-contrast lettering and their messages might have been easily overlooked. Signs were written in the local language (example); symbolic signs, though long used on certain tradesmen's signs

	Created by Ernestina Mata over 9 years ago

What is a warning sign, why we use them. where can we find them

Warning signs