Ah ha! It appears that Mark might be seeing a ‘hole’ in the traffic, that is, a trough in the drive time that opens up 25 minutes or more after the earliest departure time. Therefore, he might get a bit more sleep without paying too harsh of a penalty in
the form of a longer commute. However, he’d better be careful, further delays from this point could cause him to be very tardy for work at Stat‐Ease.