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On busy lanes, where public transport buses are frequent, bus bunching is a common phenomenon:

reference trajectories
Reference trajectories

Bunching leads to non-homogeneous utilization of buses and therefore degradation of service quality.

The objective is to (i) adhere buses to a timetable and (ii) guarantee equal headways.

The proposed control methodology is a shrinking horizon model predictive velocity control. 

Different control strategies are considered:
(i)    timetable tracking: buses prioritize the timetable over the headway reference.  
(ii)    headway tracking: buses try to keep equal headways.
(iii)    balanced: both objectives are equally important.

The controllers are simulated in VISSIM in a realistic traffic setting (Göteborg):

Line16 in Göteborg

 The system was evaluated in the event of severe perturbation

(Xdes: desired position, Xref: reference position, ETD: estimated time of departure):

Simulated trajectories

Read our related publication:

B. Varga, T. Tettamanti, B. Kulcsár: Optimally combined headway and timetable reliable public transport system. In: Transportation Research Part C: Emerging Technologies, vol. 92, pp. 1 – 26, 2018, ISSN: 0968-090X.
Written by: BME Traffic Lab | Date: 07/02/2023 11:52 AM