> -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf > Of Olin Lathrop > Sent: Monday, April 10, 2006 3:01 PM > To: Microcontroller discussion list - Public. > Subject: Re: [OT]: The mystery of the "oh" > > Marcel Birthelmer wrote: > > On the other hand, things like > > interstate 101 (which runs from LA or something up into oregon or > > something) > > All interstates that go long distances have 2 digit numbers. Three digit > numbers means a ring road if the hundreds digit is even, and a spur if the > hundreds digit is odd. In either case the two low digits refer to the > "parent" interstate that the spur or ring is supposed to be an offshoot > from. Therefore interstate 101 being 1000 miles long from southern CA to > Oregon is rather unlikely. Not necessarily a loop (beltway, ring, bypass, et al) if even. It means a connection between two other interstates. In Maryland for example I-270 connects I-70 to I-495 but no complete or even partially complete ring or loop is attempted. I-370 spurs off of I-270 but does not connect to another interstate. The circular city by passes manage to be loops normally since like I-495 around DC to be a by pass it connects I-95 on one side of the city to I-95 on the other around Washington D.C. And of course with all grand scheme plans in the intervening years exceptions to the rules have been made. FWIW, x0 (and even numbers in between) interstates are east west starting in the south while x5 and odd numbers in between) interstates are north-south starting in the west. The older federal highways were about the same with x1 in general more important than x5 but in reverse order. There are any more exceptions to the general plan with highways than interstates. ------------------------------------- Notice of Confidentiality ---------------------------------------------------------- This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify postmaster@vgt.net. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist