On 05/08/2019 20:55, bert wrote:
In article , Ian Jackson
writes
In message , Harry Bloomfield
writes
Steve Walker brought next idea :
whereas merging at the pinch-point often means cutting into a small
gap,Â* causing those behind to brake and the ripple effect to bring
the whole roadÂ* to a halt or slowing to a stop yourself and holding
up the traffic behind.

Not if the merge is orderly and with cooperation from both lanes,
which is what you get as a result of no one being able to bypass the
queue.

Early merges, leave one lane less than fully occupied and space for
the impatient to bypass the queue.

What you're saying is that late, 'co-operative' mergers force the
'unco-operative' would-be queue-jumpers to 'co-operate'. Well, this is
true - but it often leads to a log-jam at the pinch-point, and that
creates tail-backs that probably would not have happened if everyone
had merged early, and (if possible) maintained speed.
Whichever way you do it 3 into 2 doesn't go.


Assuming every car is keeping the recommended stopping distance for the
speed, on a single carriageway:

MPH Cars per Hour
10 1503
20 1912
30 1753
40 1559
50 1385
60 1239
70 1117
80 1015




--
djc

(–€Ì¿Ä¹Ì¯–€Ì¿ Ì¿)
No low-hanging fruit, just a lot of small berries up a tall tree.