http://Traveling.lifetips.com/Traveling.LifeTips.com Tip of the Dayen-USLifeTips.comhttp://Traveling.lifetips.com/rss/lt-logo-green.gifhttp://Traveling.lifetips.com/tip/69663/on-the-road/highways-and-by-ways/interstate-numbering.htmlSat 7 Nov 2009 00:00:00 GMT4169E5D3-345E-4774-2650-185E4A5CCBACInterstate highways in the US have a prefix "I" and are numbered with odd numbers for east-west roads and even numbers for north-south roads.<br/><br/><br/>For more Traveling tips, visit <a href="http://Traveling.lifetips.com/">http://Traveling.lifetips.com</a> <img src="http://Traveling.lifetips.com/images/aggbug.asp?id=69663" height="1" width="1">