The 6300 Series count up or count down timers will count days, hours, minutes, seconds, and 100th Seconds (in the timer mode), or it can be changed to a clock mode to display the time of day. This timer can also be used as a count up or count down timer, or track or tally events or inputs.
Using a visual paging system you can page trucks by truck number to a given dock. Simply place a display on the outside of each dock and assign trucks a number as they arrive in the loading yard.
Using vibrating pagers, you can actually allow truckers to sleep while they wait, and wake them with the pager when you are ready to unload their truck.