×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

profile grade break instead of vertical curve

profile grade break instead of vertical curve

profile grade break instead of vertical curve

(OP)
Do anyone know where to find guidance on roadway profile grade breaks. It seems everyone i talk to has a different answer. I have a roadway with a design speed of 35 mph with a 100' sag curve. i want to get rid of the sag curve and replace it with a grade break but not sure if an AD value of 1.5% is Ok

RE: profile grade break instead of vertical curve

The number I've heard is 1% maximum on a grade break.
Why not use a shorter curve length, say 20' to 40'.


Some discussion at thread194-174877: Alley Profile Question
 

RE: profile grade break instead of vertical curve

Generally, a maximum vertical grade break without vertical curve is limited to the 0.5%-1.0% range.  For instance, for a rural gravel road 1% may be allowable, but for a paved highway the limit is probably 0.5%.  The design speed and surface material are the two main factors that are considered in these requirements.

RE: profile grade break instead of vertical curve

If it's a public road you should check local regulations. In these parts a vertical curve is required on public roads if the algebraic difference is 1% or more.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources