No fail. Drivers on the highway, if they kept space between each other, could continue the same rate of speed while allowing the merging traffic to enter in the spaces.
Instead, people BUNCH as they approach a merge in the hopes of "not letting the guy get in front of me" so the merging traffic is forced to cut people off and the result is a lot of people hitting their brakes. The chain reaction of people cutting off, hesitating and speeding up to "go faster" creates a nice 10 minute delay.
A lot of routine traffic slowdowns could be avoided if people kept distance and allowed merging traffic to enter. At the same time, people need to understand that they need to enter traffic smoothly at a merge and not hesistate. If both sides actually know how to fucking drive, we'd all get there much faster.