Max Deflection without Horizontal Curve
Max Deflection without Horizontal Curve
(OP)
This does not seem to be covered in AASHTO, but I’ve seen two equations used to determine the max deflection that can be used without a horizontal curve:
1. arctan(1/design speed)
2. arctan(60/design speed^2)
What is the appropriate criteria & reference to use for this situation?
My application is a 4-lane local road with 35mph design speed.
Thanks.
1. arctan(1/design speed)
2. arctan(60/design speed^2)
What is the appropriate criteria & reference to use for this situation?
My application is a 4-lane local road with 35mph design speed.
Thanks.





RE: Max Deflection without Horizontal Curve
RE: Max Deflection without Horizontal Curve
RE: Max Deflection without Horizontal Curve
V > 45 mph L = WS2/60
V >= 45 mph L = WS
and plug 1 in for W to give you a rate.
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"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail."
Wm. Phelps Eno, ca. 1928
RE: Max Deflection without Horizontal Curve
Thanks