Proposed Roadway Profile at Top of Curb
Proposed Roadway Profile at Top of Curb
(OP)
The Client has asked that all street design profiles will need to be based on top of curb elevations, not centerline elevations.
The Proposed roadway will be a 4-lane roadway with a 14-ft raised median with curb&gutter along the median and outside lanes.
I plan to set the profile grade point at the left & right top of curb at the median. I don't know what happes when you lose the median to form a left-turn lane. Does the profile show a vertical drop? In addition, how do I check for design criteria like K values when my profile is along the top of curb? Do I offset the profile down in Geopak to check these values?
The Proposed roadway will be a 4-lane roadway with a 14-ft raised median with curb&gutter along the median and outside lanes.
I plan to set the profile grade point at the left & right top of curb at the median. I don't know what happes when you lose the median to form a left-turn lane. Does the profile show a vertical drop? In addition, how do I check for design criteria like K values when my profile is along the top of curb? Do I offset the profile down in Geopak to check these values?





RE: Proposed Roadway Profile at Top of Curb
RE: Proposed Roadway Profile at Top of Curb
You may also draw as many cross sections as necessary to define the roadway.
Your guide should be to answer the question; Can an experienced Contractor build this road based on the information shown on my plans ?
Only if your Client will stamp and sign the plans should he , or she, dictate what they must contain. Besides, some junior engineer at some regulatory agency can probably overrule you both.
good luck
RE: Proposed Roadway Profile at Top of Curb
RE: Proposed Roadway Profile at Top of Curb
You can design the roadway like you always do, then profile any aspect of the proposed improvements including crown, centerline, TC, gutter FL, EP, etc.
I have seen this with several municipalities and is not that uncommon around these parts (Northern California), although mostly you see centerline or crown. It's mostly when you have a local jurisdiction (city, county, special district, etc.) as a client that you get these kinds of requests. If you have sweeping horizontal curves, profiling TC on the outer edges of the roadway helps to visualize a superelevation if it is a higher speed roadway.
Bottom line is you don't need to change the way you are use to designing a roadway. You just change what you are normally accustomed to profiling on the plans.
RE: Proposed Roadway Profile at Top of Curb