Oval Shape Roundabout
Oval Shape Roundabout
(OP)
Am Designing a roundabour for a dual carriageway road, due to space limitation am thinking of designing an oval shaped roundabout can some one give me a guide,literature or any usefull information that will help me in designing this round about. the biggest size of truck in this road is wb50 truck





RE: Oval Shape Roundabout
http://www.dft.gov.uk/ha/standards/dmrb/vol6/secti...
RE: Oval Shape Roundabout
RE: Oval Shape Roundabout
RE: Oval Shape Roundabout
RE: Oval Shape Roundabout
I like them, I find they are far more efficient than 4 way stops. We had a 4 way stop near a college that was always a backup point with the 4 way stop signs that used to be there. Since they have put in a roundabout, most of the time you just drive through. Every so often, a few cars might back up waiting for a chance to enter but no where near the backup that used to regularly exist.
Some people do find them challenging though and from the letters in the paper every so often, some hate them.
RE: Oval Shape Roundabout
I'm more of a water systems guy, so I don't have a lot of road design experience and none when it comes to roundabouts. However, I think elliptical would be a bad idea because drivers seem to handle circular horizontal curves better than varying curves. That's probably why spiral curves for highway ramps have fallen out of favor here. I suspect an oval would be less of a problem for car control. I doubt either shape makes sense for traffic control.
BTW, there are a handful of residential neighborhoods in my city that have oval roundabouts. Basically they are long, fairly wide, landscaped medians that allow the main local street to pass through the neighborhood (one way each side), but block the several side streets from crossing the main street. In another case, the oval was so wideand long that it actually functioned as a park. The local residents petitioned the city to change the one-way traffic lanes on the main road to two-way traffic and eliminate curb parking to gain the necessary width.
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"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill
RE: Oval Shape Roundabout
Look up Avon, CO on Google Earth - there are five back-to-back roundabouts, including a teardrop and oval shape.