A value and K value

[Anonymous]

Hi there, in autocad civil 3D, there is a A value for alignment design. What is the difference between A value and K value?

[Joe-Bouza · Accepted solution]

A= that algebraic difference of the grades going in an coming out of a vertical curve.

K = the rate of change of a vertical curve

L= the length of a vertical curve

K=L/A

A= g1-g2

AASHTO has these definition and recommendations for vertical curves based on design speed, sight distance etc.

[Anonymous]

Thanks for your reply. Thank you very much.

[Murph_Map]

Joe,

Don't forget that Weds is pie day.

[Joe-Bouza]

Thats Right! I cant decide on Sweet or Savory.

[Raisk]

Hi,

How  can we define A value for horizontal curve?

Thanks in advance!

[g_k50]

Use the bearing of the street going in and the bearing of the street going out, that would be D also.