[CrispyKerosene]

I understand that my argument will lead to the inevitable 'well if everyone one followed all the rules all the time' type response, but there if people are leaving the appropriate following distance with perhaps a bit extra at the as they approach the zipper merge, than there is no reason the merge cannot take place at near highway speeds, certainly with no need to stop.

Its no different than how a freeway entry works.

[NoMoreNicksLeft]

I can't prove it, but I suspect (strongly) that whichever method you believe to be the correct one, following distances must shorten dramatically, or speeds must drop so low as to threaten traffic jams (which, perversely, leave everyone bumper to bumper). It's all about how many cars are trying to use that stretch of road for a period of time, and if all are to fit through within that window, there is both a minimum speed and a maximum following distance. Wish I wasn't a math flunky.

[CrispyKerosene]

I think most people are just unaware of how much distance is required between to cars at highway speeds to considered safe. A proper buffer would leave lots of room to absorb the extra cars and loss of speed. That the point, its flexible and elastic.

[pixl97]

> if people are leaving the appropriate following distance

The general rule is, no, they are not. Unfortunately there is really no penalty in the US if you're following to close unless you get in an accident. I quite often drive on I-35 and so often it's in conditions I call a fast moving traffic jam. People are traveling nearly 80MPH with 2 car distances between each other. Quite often this turns into multi car pileups because someone has to emergency break.