cement
gray haired dude
"Don't Hit the Car in Front of You": Stating the obvious reducing accidents in Arlington, VA
http://www.governing.com/blogs/view/gov-ridiculously-simple-sign-may-have-prevented-collissions-In-virginia.html
http://www.governing.com/blogs/view/gov-ridiculously-simple-sign-may-have-prevented-collissions-In-virginia.html