01374335

Component

https://doi.org/10.3141/2277-03

http://scholar.google.com...nela&publication_year=2012

The accuracy of vehicle location plays a pivotal role in several applications for bus network operations such as service control, warnings about low bridges, accurate prediction of bus arrival times, and traffic signal priority, as well as when historical operational data are used to measure network performance. In the context of iBus, an automatic vehicle location and control system deployed on all 8,400 buses operated by London Bus Services Limited (London Buses), tests demonstrated that the solution based on the Global Positioning System (GPS) provides location accuracy within 10 to 12 m 95% of the time; this timing is sufficient to support operational needs. To meet that level of location accuracy, the system must operate with a high degree of availability and accuracy on all vehicles. The challenge is to install, maintain, and repair vehicles so that they can operate at the required levels of performance under harsh operating conditions. Buses have many components—including the odometer, gyrocompass, aerials, WiFi, and power units—that can fail. This paper presents three approaches that London Buses uses to identify vehicles that have faulty hardware. One technique has also proved to be beneficial in testing new navigation software releases and in identifying design and parameterization problems that affect the quality of the navigation solution. The results will interest those involved with testing, maintenance, and repair of GPS-based vehicle fleets. These methods have helped ensure that London Buses can successfully observe 98% of all operated bus stop visits.

01453431

12-0121

English

pp 21–28

2012

Transportation Research Record: Journal of the Transportation Research Board

9780309223317

Print

Figures; References; Tables

Automatic vehicle location; Bus transit operations; Equipment maintenance; Fleet management; Global Positioning System; Navigation systems; Vehicle maintenance

iBus (London, England)

Public Transportation; Vehicles and Equipment; I72: Traffic and Transport Planning; I91: Vehicle Design and Safety

TRIS, TRB, ATRI

Feb 8 2012 4:53PM

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