The bottleneck is only one factor. The distance traveled in one lane
rather than two is a factor as well. Plus, if everyone merges at the
same point, it's generally better than random merging. In any case,
the merges in NJ, where they're executed at the last moment, go much
smoother than the merges here in Detroit, which occur half a mile or
more before they have to.
Paul
On May 7, 2009, at 2:01 PM, Bob Sullivan wrote:
Paul,
The amount of cars that can pass thru the bottleneck has a fixed
maximum per hour.
It's something like 2,000 vehicles per hour thru a lane.
That's roughly a continuous line of cars at 30 mph.
When you try to jam more thru, the flow breaks down.
Unstable waves of cars turn the lane into stop and go traffic.
Selfish merging does the same thing.
Regards, Bob S.
On Thu, May 7, 2009 at 12:46 PM, Paul Stenquist <[email protected]
> wrote:
But the distance you travel in a single, slower lane becomes less
if you
wait to merge. So if the single lane is slower than the two double
lanes,
efficiency is gained by merging at the last opportunity.
Paul
On May 7, 2009, at 11:08 AM, Bob Sullivan wrote:
Bob,
That's not really true.
Make the pipe as big as you want (as many lanes) before the
constriction (to one lane).
Traffic flow will not improve.
Regards, Bob S.
On Thu, May 7, 2009 at 2:29 AM, Bob W <[email protected]> wrote:
If everyone merges early they still need to know the rule to
avoid huge
jams
in one or both lanes, but the unused lane is no longer serving
traffic,
so
the total speed of the traffic is much slower.
Bob
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