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Ian Jackson[_2_]

In message ,
writes
On Thu, 8 Oct 2015 17:18:54 +0100, Ian Jackson
wrote:

In message ,
writes

Since both the roundabout and the 4 way stop usually are installed to
slow traffic down (in the US) , not to make it go faster, I am not
sure what myth busters proved.
The most efficient traffic movement in high traffic areas is obviously
vertical separation but the next choice is a system of well timed
lights.

Yes, when your reach a roundabout, it does temporarily slow you down
(even when the traffic is flowing well) - but with luck, nobody actually
stops.

However, even the best system of well timed traffic lights is almost
certain to bring someone to a stop. That's what the lights are there
for!

Would you have a roundabout at every intersection?

In the UK, many of the older main roads that have been gradually
upgraded do indeed have roundabouts at most of the major intersections.
Where necessary, some have triggered traffic lights (hopefully part-time
- but often not!). While roundabouts go a long way to keep the traffic
flowing, they cannot alone cure all ills.

Where a minor road crosses, the crossing is often staggered, where you
cross in a zig-zag fashion - first across one carriageway, stop (if
necessary) in the central reservation, and then continue across the
other carriageway.

Many lesser main roads and downright small roads also have roundabouts
(often minis). The latter may simply consist of a solid round circle (3'
or 4' diameter, and sometimes slightly domed so that traffic can pass
over it if necessary), painted in the centre of the junction
(intersection). In all cases, you give way to traffic which would
otherwise hit you from the right (as we drive on the left here). It's
second-nature to do so, and there are no ifs or buts.

Don't forget that, over here, many roads date back to Roman times, or
even earlier!
--
Ian