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Old 10-14-2013, 01:27 PM
 
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Quote:
Originally Posted by SFspiderman View Post


My understanding is that the Wade Avenue Extension was never actually signed as "I-40" because it never met Interstate standards. Instead, it was signed as "To I-40" back when I-40 didn't go beyond the current Wade Ave split.
Correct - locally, I-40 extended from the Wade Ave extension to NC 147. This apparently satisfied an IBM request for four lane highway access for the Davis Drive IBM facility in the early days of RTP.

I-40 was then extended west from RTP in advance of the Special Olympic Games being held here.


Frank
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Old 10-18-2013, 08:30 PM
 
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Originally Posted by rfb View Post
I'm not sure I-540 will ever be renumbered I-640. The portion south of I-40 was renamed NC-540 when it was made a toll road is not part of I-540.
This is true, but if the last section of the loop (from I-40 near the Wake/Johnston border to the current end of I-540 near Knightdale) is not tolled, then the North Raleigh/Knightdale portion could still be renamed I-640.

However, I wouldn't be surprised if they tolled that portion of it, too.
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Old 10-18-2013, 09:45 PM
 
Location: Cary, NC
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Technically, NC should already be on the verge of having to rename it I-640, as they've applied to have the section of US-64 between I-440 and I-540 marked as I-495, with the remainder of US-64 out to I-95 signed as Future I-495 until it can be brought up to interstate standards.

But part of the application included a request for a waiver of the rule that would have required them to change I-540 to I-640. The waiver is based on "public expectation, historic controversy, and economic burden of sign replacement" and cites several examples in NY and PA as precedents for the waiver.

The I-495 signing request was approved by the AASHTO U.S. route numbering committee back in May, but it was conditional upon approval from the Federal Highway Administration. I don't believe that final approval has been given yet.
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Old 10-19-2013, 06:05 AM
 
9,198 posts, read 21,151,892 times
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Quote:
Originally Posted by SFspiderman View Post
Technically, NC should already be on the verge of having to rename it I-640, as they've applied to have the section of US-64 between I-440 and I-540 marked as I-495, with the remainder of US-64 out to I-95 signed as Future I-495 until it can be brought up to interstate standards.
why would the change to US64 require a change to I-640?
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Old 10-19-2013, 07:34 AM
 
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And also, why would a spur running from I-95 to I-440 be called I-495, instead of an odd number?

To answer my own question: I did some research and found that an interstate spur that ends at another interstate gets an even numbered designation. I always thought it had to rejoin the parent interstate to get an even number.

Last edited by rfburns; 10-19-2013 at 08:42 AM.. Reason: Answering my own question
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Old 10-19-2013, 09:00 AM
 
Location: Cary, NC
2,801 posts, read 3,761,512 times
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Quote:
Originally Posted by CHTransplant View Post
why would the change to US64 require a change to I-640?
Because I-540 would then connect two other interstates (I-40 and I-495), which would mean it should have an even first digit.

(Same situation noted by rfburns: US-64 becomes even I-495 because it will connect I-440 and I-540, and eventually I-95.)
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