There is even a sign about the zipper method at one merge area in our area (often clogs during peak periods). It does not work much better than the usual get in any way you cab. People cannot just slip in...some drive fast to the end and then expect to be allowed in. It only takes a few over eager types to ruin a good idea.

I had the privilege to drive on I-285 north side of Atlanta on a Friday during a holiday weekend as the interstate slowing went to 2 lanes (from up to 5+) and it was a mess. The net was everyone went no where. What did not help were the coasters (those that want to go a specific speed and not brake) so it was uneven at best with large gaps between vehicles. It happened in all lanes. If everyone does not drive with the same mindset then it is gridlock.