Measuring Bus Service Reliability: An Example of Bus Rapid Transit in Changzhou

Abstract

Abstract

Analysis of a performability model for the BRT system

“…For verification of results, and demonstration of the adequacy of the built models, two studies were carried out considering BRTs scenarios. The first study compares the results obtained from the CTMC model with a study of a BRT system performed by Huo et al (2014). Algebraic expressions were used to calculate the reliability of the BRT system and consequently the vehicle failure time, in this case, the data for system composition was obtained from the website of the company, Volvo (Volvo Construction Equipment, 2013), as well as the manufacturers of components and safety systems, aiming to assign MTTF parameters to the models.…”

“…For the composition of the first scenario, a dataset taken from Huo et al (2014) as given in Table 1 was used, and the probability of vehicle arrival time in the final station in a specific time period of the day was calculated. The periods of the day were defined according to the peak intervals defined by cite zhao2014measuring.…”

“…For the calculation of the probability, i.e., the possibility of the vehicle reaching the destination in a certain time interval, the travel times between the stations are considered, where α tt , refers to the time of bus trip from the first station to its next station, and α ttw refers to the travelling time of the other stations, considering the time stopped at the station plus the travel time to the next station, in this case, the Station_1 to the Station_6. Table 1 describes the travel times for five different intervals in a particular route (Huo et al, 2014). The travel ranges are: early, AM peak, inter-peak, PM peak and evening.…”

“…In order to analyse the performability, a CTMC model that is composed of the described systems above, has been created. The scenario described in the Changzhou BRT (Huo et al, 2014), which details travel times and, from these, calculates system reliability, was employed to verify the system validation.…”

Improving bus service reliability: The Singapore experience

“…In Changzhou's Bus Rapid Transit, four measures are used as indicators of reliability (Huo, Zhao, Li, & Hu, 2014). One statistic used is the coefficient of variation of headway, which is the standard deviation of headway divided by its mean.…”