New Green Book

[ACtrafficengr]

Has anyone gotten a look at the new Green Book yet?

Just wondering what the major changes are. I understand the low volume roads guidelines will be incorporated.

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"Come to think of it, there are already a million monkeys typing on a million typewriters, and the Usenet is NOTHING like Shakespeare.

Blair Houghton

 

[ACtrafficengr]

From the AASHTO website:

A Policy on Geometric Design of Highways and Streets, 5th Edition

This fifth edition of AASHTO's "Green Book" contains the latest design practices in universal use as the standard for highway geometric design and has been updated to reflect the latest research on superelevation and side friction factors as presented in NCHRP Report 439. New exhibits in Chapter 3 will help designers to quickly and accurately determine the side friction factor used for horizontal curve design, the superelevation rates for various curve radii, and the minimum radii with normal crown for each of the five maximum superelevation rates.
-- The 2004 edition is also available on CD-ROM (single-user version)

Expected date of release: Late December 2004.




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"Come to think of it, there are already a million monkeys typing on a million typewriters, and the Usenet is NOTHING like Shakespeare.

Blair Houghton

 

[ACtrafficengr]

Got it!

I was wrong about the LVRR guidelines - it refers to them, but they are still in a separate document.

The new superelevation tables result in higher e's for most curves.

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"Come to think of it, there are already a million monkeys typing on a million typewriters, and the Usenet is NOTHING like Shakespeare.

Blair Houghton