Abstract
Adherence to the schedule is of prime importance in public transport. This paper presents a specific application of the Gini coefficient, well known indicator in economics, for the headway adherence assessment. The paper shows that Lorenz curve, which is usually used to define mathematically the Gini coefficient, is a good indicator of the users' waiting time when it is based on the bus schedule. When it is computed on the basis of the ratio of observed headway to the schedule, it is a powerful visual tool that can be used by operators to detect the existence of irregularities on a bus line at a glance. An equation gives, in an idealistic case, the impact of any single traffic disturbance on the Gini coefficient, making this coefficient comprehensive. A detailed analysis is developed, based on the bus proportions according to the headway adherence level. These proportions are obtained from new indices coming from the derivative of the Lorenz curve. The values of these indexes alert the operator of any adherence disturbance. The examination of the Lorenz curve takes more time, but is worthwhile, giving the types of the irregularities The application of these indicators is carried on real-time data from the New Delhi bus network.
Highlights
The reliability of bus travel time is an objective of major concern for bus operators and users
The ability to accurately and effectively analyze various performance measures is fundamental to determining how well the bus service is adhering to its service standards
Headway adherence is often measured when the bus service is operating at headway of 10 minutes or less scheduled; while on-time performance is evaluated for all services with a published timetable
Summary
The reliability of bus travel time is an objective of major concern for bus operators and users. The ability to accurately and effectively analyze various performance measures is fundamental to determining how well the bus service is adhering to its service standards. Understanding and developing methods to assess transit operations performance are valuable in identifying potential problem areas along a route; it is constructive in proposing effective strategies to improve service reliability. Headway adherence is often measured when the bus service is operating at headway of 10 minutes or less scheduled; while on-time performance is evaluated for all services with a published timetable. The reliability of the bus travel time is studied using the Gini coefficient and the Lorenz curve regardless of the service planning. When the bus service is planned as a timetable, the travel times of buses are converted to headway
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