|Uneven flooring sign, Toronto, Ontario, Canada. June 2016.|
Toronto was so solicitous to offer the above sign in a corridor somewhere, in which construction was occurring.
Some countries should have this sign at all of their border points.
And why not? The United States has this sign at one of its border crossings:
|Beware poisonous snakes sign at US border, Antelope Wells, New Mexico. March 2013.|