The problem is, there are two very different ways to merge based on the flow of traffic. If traffic is moving, then early merge is the preferred method. If tr

The problem is, there are two very different ways to merge based on the flow of traffic. If traffic is moving, then early merge is the preferred method. If traffic is not moving, then a late merge makes more sense. The problem is people who do not merge early when traffic is flowing. These people wait until the last second to merge instead of finding an opening while traffic is flowing and force traffic to slow down in order to let them in. And the really real problem is that the average driver in the USA has no idea what they are doing and should probably not be driving at all. It would take a huge change in the way we train drivers to get them to recognize when they should use each type of merge. And forcing people into one way to merge or the other is not really the "fastest/safest" way, because it varies on conditions.