i 100% agreed with poolman.
it also let the drivers to have a proper break,work life
balance.
my suggestion is
1 taxi-3drivers + 1 super relief for holiday/sick/holiday.
Driver A(hirer) drive day,mon-sat
Driver B(relief) drive night,mon-sat
Driver C(relief) drive sunday as OMO or share with super
relief
Driver D(super relief) drive as per needed when the drivers
off.
the rental per day is about $120,must fully put the taxi
OTR.
4 drivers can help each other when anyone of them not able to
drive.