From: utzoo!decvax!harpo!ser
Newsgroups: net.general
Title: Re: Interstate Highway numbering - (nf)
Article-I.D.: harpo.1066
Posted: Thu Sep 23 09:01:25 1982
Received: Mon Sep 27 19:58:51 1982

#R:ihuxu:-11000:harpo:800017:000:236
harpo!ser    Sep 23 08:53:00 1982

If I remember correctly, odd prefixes on three digit interstates indicate
"spurs", i.e., routes into or out of major cities, while even prefixes
indicate "circuits", i.e., routes around major cities.

						Steve Riegel
						harpo!ser