> In order to efficiently merge safely, you have to have both lanes finished 
> merging before you get to the end of either lane. Zooping up to the front 
> just because the people before you have already merged means you're no 
> longer zip-merging. Instead, you have a zipper with an extra tooth on one 
> side, and you know how well *that* works.

Indeed, the important point is that everyone should merge at the same point 
to make it efficient.  The obvious solution is that everyone merges near to 
the lane closure, not randomly 500 metres, 1 km or 2 km back up the road as 
they feel like it - that is pretty much the most inefficient way of doing 
it.

Anyway, these are the *average* efficiencies, if you're the one who always 
merges at the end of the lane then you'll be better off if everyone else 
merges sooner :-)  What the people who merge really early don't realise, is 
that if they merged later not only would they get through quicker, but 
everyone else would on avereage too.  So in fact it is them that are causing 
the problem, not the ones who merge at the end of the lane.

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