Section 2 : Timetabling Continued

Interworking Separate Services

From a cost point of view, the main aim of the schedule compiler is to minimise the number of buses in service at any time.

The objective of the schedule compiler can also be expanded in this way; to minimise the number of buses in service at any time by elimination of excess layover time whilst ensuring that all required trips are operated.

Reductions in the number of buses used can be made by examining a collection of routes to see if two or more can be interworked.

In this example two separate services will be looked at. The first, will be familiar, whilst the second hasn’t been looked at before.

Service 2 from Town Centre to Goodwin, ,

Service 5 from Town Centre to Corncross

Running Times16 minutes in each direction (service 2)
10 minutes in each direction (service 5)
Layovers2 minutes at each terminal point
Headways10 minutes

Calculate the number of buses required

Apply the scheduling formula for each service separately

Service No 2

16 + 16 + 2 + 2 / 10 = 36 / 10 = 4 buses + 4 minutes

Service No 5

10 + 10 + 2 + 2 / 10 = 24 / 10 = 3 buses + 6 minutes

Working Timetables for independent operation

Service No. 2

Bus No       12341234123
Town Centre07000710072007300740075008000810082008300840
Goodwin07160726073607460756080608160826083608460856
            
Goodwin 07180728073807480758080808180828083808480858
Town Centre 07340744075408040814082408340844085409040914

Service No 5

Bus No       12312312312
Town Centre07000710072007300740075008000810082008300840
Corncross07100720073007400750080008100820083008400850
            
Corncross 07120722073207420752080208120822083208420852
Town Centre 07220732074207520802081208220832084208520902
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