But the single lane does become slower than two lanes in that someone
invariably slows to a crawl. The less time and distance that's
allocated to traveling single file, the more efficient you become.
With two lanes, the left is generally faster than the right, so the
longer you travel in two lanes, the faster your average speed. Once
you've merged into a single lane, you can go no faster than the
slowest car. Yes, the bottleneck of the merge meters the flow, but
it's only one factor.
Paul
On May 7, 2009, at 2:30 PM, John Francis wrote:
But the single lane *isn't* slower than the two double lanes.
The choke point (the construction) limits the amount of traffic
that can pass. The same amount of traffic passes that point
no matter whether it is fed by a single lane travelling at X mph
or by two lanes each travelling at 0.5X mph.
There is a second-order efficiency gain by having multiple lanes,
though; if somebody stalls, overheats, or has some kind of a problem
there is still some traffic flowing in the other lane.
On Thu, May 07, 2009 at 01:46:44PM -0400, Paul Stenquist 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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