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hisher duty. The result of UNV is the affected part of the duty not covered. In this research, we investigated UNV times of between 30 to 120 minutes.
4.2.2 Crew Rescheduling
Assumptions and Rules
For the experiments purpose, two assumptions were made. These assumptions were made based on informal discussions with crews and according to EC driving hour rules.
First, that there was no violation of crew rules regarding relief time 45 minutes, and maximum driving hours 9 hours maximum, in a day as ruled by EC driving hour rules.
Second, in case of lateness and delay at least 5 minutes is needed for crews to be ready for work after sign-on, 5 minutes to start relief and to start second work after relief, and
5 minutes for sign-off after finishing work. The rescheduling rules show how the proposed system does the rescheduling whenever
an event takes place. The rules are drawn up based on the manual rescheduling as discussed in Chapter Three and also according to the assumptions above. Below are the
details of the rules:
a Lateness and delay. In this event, the system should be able to reschedule their duty
to available crews at the garage. The available crews could be crews that have signed- on but have not started driving, crews on relief, or crews that have finished their duty
but not signed-off yet. The system should choose a crew that has the starting time nearest to the ready time arrival time plus 5 minutes of the late-crew. The ready time
of the late-crew is the arrival time plus 5 minutes to get ready for driving. This will ensure that the late-crew does not need to wait long. The chosen crew’s original duty
may be given to the late-crew. Several rescheduling processes might occur until the match is found. In the case of more than one rescheduling being needed, the principle
was to minimise the effect of rescheduling by trying to find the best solution where crew involvement is the least.
b Unavailable part of duty. In this type of event, the system should be able to
reschedule the part of the duty to available crews at garage. The available crews could be crews that have finished their duty but not signed-off yet. The system should choose
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a crew from the available crews that have the lowest driving hours and, after adding the new duty, the total driving hours should not exceed maximum daily driving hours.
The next subsections discuss examples of the crew rescheduling rules applied to every type of event in detail.
4.2.3 LFSO and
