Turnouts exist. Unfortunately, head-of-line-blockers are very commonly already overwhelmed by the task of keeping tab of their own vehicle; would be a far stret

Turnouts exist. Unfortunately, head-of-line-blockers are very commonly already overwhelmed by the task of keeping tab of their own vehicle; would be a far stretch to expect them to simultaneously stay aware of traffic situations, spot the turnouts ahead, and then take the turnout.