×
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

One main street(east- west) and cr

One main street(east- west) and cr

One main street(east- west) and cr

(OP)
One main street(east- west)  and cross street(north-south) are intersecting.  Cross street is to be designed with a crown at the center. The grade of main street is sloping from west to east. In the intersection design, how can we design an intersection without developing a low point near intersection. The problem is, for cross street, in order to have 2% slope we have to lower the elevation from crown towards edge of pavement.  On the otherhand, for main street we have to lower the grade from west to east. So, i have a problem at north west corner. Both are contradicting. Any suggestions????
Thanks
Lila  

RE: One main street(east- west) and cr

lila,

Does traffic have to stop on cross street? Is main street a through road? Is there to be curb and gutter?

If I understand your description, main street slopes downhill from west to east. What is the grade? If traffic has to stop on cross street before entering main, then design main street as if there wer no cross street. That is, carry the road crown through the intersection. Once you ahve done this you can check your grades to see how best to grade cross street at the intersection to keep runoff from collecting where you don't want it. Is there a storm drain system there? You may need to install a catch basin at a low spot.

Carry your crown on cross street only as far as the end of your curb or pavement return (if traffic must stop) then "flare it out" to match the flow line of main street. You might need to tweak the radius return grades to force drainage to flow where you want it. Don't get your slopes too flat or you may end up with "bird baths" when the final paving is done.

Intersection can be very challenging to design, I enjoy doing them. There's generally always a solution. Think in 3-D.

Good luck,
David

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