Driveway/Entryway Radius's
Driveway/Entryway Radius's
(OP)
What determines the radius of a driveway/entranceway according to roadway construction plans?
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Driveway/Entryway Radius's
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Driveway/Entryway Radius'sDriveway/Entryway Radius's(OP)
What determines the radius of a driveway/entranceway according to roadway construction plans?
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RE: Driveway/Entryway Radius's
RE: Driveway/Entryway Radius's
RE: Driveway/Entryway Radius's
A 15'or 20' radius for a commercial drive seems to be about standard.
RE: Driveway/Entryway Radius's
The radius for a residential drive is 5' to 10' radius.
In addition, the book Architectural Graphic Standards by Ramsey has driveway layout guidlelines. You have to determine the type of vehicle that will be using the driveway. Then you look up the turning radius and dimensions.
RE: Driveway/Entryway Radius's
RE: Driveway/Entryway Radius's
CDG, Los Angeles Civil Engineering specializing in Hillside Grading
http://cdg-ca.com
RE: Driveway/Entryway Radius's
RE: Driveway/Entryway Radius's
CDG, Los Angeles Civil Engineering specializing in Hillside Grading
http://cdg-ca.com
RE: Driveway/Entryway Radius's
We use 15' radii for residential driveways and 34' radii for commercial driveways. Most of our roads are rural or suburban, so smaller radii mentioned above are probably needed in urban areas. You can also get away with a smaller radius if you have a shoulder or parking lane.
"...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
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RE: Driveway/Entryway Radius's
CDG, Los Angeles Civil Engineering specializing in Hillside Grading
http://cdg-ca.com
RE: Driveway/Entryway Radius's
What I mean, is that while you are trying to meet a certain driveway spec or requirement, you may have electric vaults, meter boxes, etc in the way and that could create even more design issues for you. This is basically along the lines of the last post by brandoncdg.
RE: Driveway/Entryway Radius's
RE: Driveway/Entryway Radius's
The meter box or vault might have originally be designed for landscape applications, and now needs to be traffic rated. Or possibly the juristiction will want you to move it outside of the proposed drive altogether. Either way it will have to be re-set.
Quite possibly sewer cleanouts could be there as well, needing to be re-set into the new drive.
Even worse, a big power or telephone pole right where your drive is proposed.
Happens ALL the time. CPENG78 is pointing out it is prudent to field visit your site just to be sure. I would.
RE: Driveway/Entryway Radius's
However even if you don't find anything, next time you meet or speak with the client or other consultants, your field visit gives you an edge over those discussing potential issues.
RE: Driveway/Entryway Radius's
RE: Driveway/Entryway Radius's
BTW a useful thing to use to do a quick walk around the ROW of a site is by using google maps and zooming into street level. I was able to look through one of our large project's surveys and this to get a good idea of what was out there before I really need to walk the site. We have to move almost every vault, pole, etc. because they are dedicating the street and moving driveways around.
Were you able to find the standards by going to the Public Works website or anything like that?
Civil Development Group, LLC
Los Angeles Civil Engineering specializing in Hillside Grading
http://www.civildevelopmentgroup.com
RE: Driveway/Entryway Radius's
AutoTurn is a very cool program to model vehicle maneuvers. I have use it in a CAD platform (I don't know if there is stand alone version) which allows me to maneuver a vehicle directly on my site to simulate turning movements. It has pretty much every vehicle that you can imagine with some models included in the program and other models that you have to purchase separately. Not that I am endorsing it, but you can see how the program works at their site www.transoftsolutions.com. It also has options to design your own vehicle with turning capabilties per your specification.
I have used mainly for fire truck turning movements, but it has also come in handy in the design of driveways, delivery dock areas, parking lots and I believe with have a project coming up with STAA trucks.
I also agree, google maps and streetview has also come in handy for me as well specially in the early planning stages of a project. Technology has certainly added another tool there for pre-design purposes. In many situations, it has prepared for what to look for during a site visit.
RE: Driveway/Entryway Radius's
RE: Driveway/Entryway Radius's
In other words, if the user does not check all of the settings and adjusts for the actual vehicle being tested, the results of Autoturn may indicate that (by the computer model) a vehicle can access a site, when in reality the "real" vehicle cannot.
RE: Driveway/Entryway Radius's
I am assuming that by the maximum steering angle setting you mean the "Steering Lock Angle" and the "Lock to Lock time" variables or do you have a different version of the program? I believe I'm running version 6.1
Also, in verifying variables such as those, I typically obtain them from the city agency (fire department) or vehicle sites that tend to have the vehicle specfications. Do you or does anyone know of any other places where this information can be obtained? It would be helpful to know if there are any other resources outer.
Is there a way to approximate those values based on other information about the vehicle such as tire width, turning radius, etc?
RE: Driveway/Entryway Radius's
You are correct on the "Steering Lock Angle" and the "Lock to Lock time" variables.
Sometimes I have got the specs from the agency, and other times I have actually measured them in the real-world. I do not know of any other ways to approximate these values.