My first office job 40 years ago involved reading maps
to plot the most direct cost effective travel itineraries for coach drivers..

I was young and green, and diligently planned the most logical routes,
which I passed to managers for approval.
My work was immediately returned and I was instructed that the drivers won't comply.
In reality I need talk to them individually about the roads they want to travel on, and where they want to stop for rests.
Because all the drivers have 'personal interests and business' they need to conduct
whilst out on the road transporting holiday makers...

If things haven't changed much since then,
that quarantine coach driver might have stopped and got out at several locations,
for a smoke and banter with other drivers, go for comfort breaks in cafes and girlfriends houses,
do dodgy deals with regular customers out of the luggage compartments,
and have viral contact with loads of random mates from the airport to the emergency zone hospital...