If you are unfit for duty, you do not drive.
I don't disagree with the gist of this ... however:
(at the booking-on counter)
Driver "I slept badly last night and I feel fatigued."
Manager "Are you fit for duty, yes or no?"
Driver "No".
Manager "So you're reporting sick then?"
Driver "I don't want to report sick but"
Manager "Are you sick, yes or no?"
Driver "OK I'll go off sick then".
After returning for duty, couple of months down the line:
Driver "I slept badly last night and I feel fatigued."
Manager "Are you fit for duty, yes or no?"
Driver "No".
Manager "So you're reporting sick then?"
Driver "I don't want to report sick but"
Manager "Are you sick, yes or no?"
Driver "OK I'll go off sick then".
Driver is now called in for a disciplinary interview and issued with a warning for attendance.
Few weeks later, at the booking-on counter:
Driver "I slept badly last night and I feel fatigued."
Manager "Are you fit for duty, yes or no?"
Driver "No".
Manager "So you're reporting sick then?"
Driver "I don't want to report sick but"
Manager "Are you sick, yes or no?"
Driver "No, hopefully I'll be ok".
Later that shift, SPAD.
I confess I don't have a solution to how the above state of affairs should ideally be managed, but I've seen the above so many times.