Most roads in the USA will not use speed limit units of miles per hour on January 1st 2040.

Created by Mati on 2014-02-24; known on 2040-01-01

• Mati estimated 17% on 2014-02-24
• procran estimated 10% on 2014-03-01
• scrafty estimated 20% on 2014-03-04
• JoshuaZ estimated 35% on 2014-03-06
• lavalamp estimated 2% on 2014-03-06