1 point
Could be someone slowly passing. Which can cause issues, even if it is totally legal.
0 points
…nothing wrong with passing slowly as long as folks merge right afterward…
2 points
If someone takes a really long time with it, it can cause a huge holdup which can cause issues.
1 point
…if everyone keeps right except to pass, any holdups are only briefly intermittent while traffic as a whole flows at an optimal pace for the road capacity…
…traffic-flow problems come from lazy drivers attempting to passively ride in a steady state rather than actively driving…