Time on duty is limited to no more than 10 hours per shift.

The line speed was about 250 cars per shift.

Women who work in them may service a dozen or more men per shift.

"The guards are in three shifts, eight men per shift."

The department staffs a minimum of four firefighters per shift at all times.

For agents in cars, the average ticket number per shift dropped from 54 to 51 during the same time.

Dividing by $5.25 for an average trip gives 23 rides per shift).

There was also security work (four people per shift), and staff in charge of administrative processes.

The standard is three 8-hour tapes per day, one per shift.

Two cops per shift, all of whom could be brought into action in case of an emergency.