Think Metric Sign
The Thinkmetric (Think Metric) Sign on the U.S.-Canadian border encourages U.S. residents to remember that road signs in Canada are now using the metric system. The sign on the left reads "Maximum 30 km/h" in Canadian format and the right states "Maximim 20 mph" in U.S.A. standard. This photo was taken on U.S. Interstate 5 on the Washington-British Columbia border.
Geography at About.com
