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Message: [QUOTE="triaddukefan, post: 2701582, member: 378"] Odd first digits are spurs..... even first digits are loops or bypasses......... there is one exception here in NC. When they first started the second outer loop around Raleigh... (the Raleigh Beltline is 440)... it was designated 540 .... and when they finished.... they were gonna change it to 640. Due to funding issues... construction has taken alot longer than expected... the NCDOT petitioned that they keep the 540 designation and the Feds agreed. I assume the Greensboro loop would have been named 640 instead of 840 if it were on the drawing board earlier. [/QUOTE]