After two posts last week with comments from a CTA driver on bus bunching, I asked the CTA for its official response on what it's doing about bus bunching. Here is its reply.
Bus bunching is an occurrence dealt with by public transit agencies throughout the world. It is the result of factors such as traffic congestion, weather-related driving conditions, increased ridership, longer boarding times, unforeseen emergencies or many other reasons including poorly timed schedules and operator behavior.
CTA has worked to address the issues that can be controlled such as the operator behavior and the schedules.
CTA continuously evaluates bus schedules and makes adjustments to the schedules to better reflect the operating conditions. Supervisors have increased focus on ensuring that operators leave the bus terminals on-time which improves schedule adherence throughout the route. CTA also has leveraged the GPS technology on buses to allow supervisors to track buses using in-vehicle computers in order to assess situations and determine what adjustments need to be made in real-time in order to alleviate bunching. Bus operators also have been given the authority to assess if a follower bus needs to bypass the bus ahead of it in order to help adhere to schedules.
In addition, CTA has also trained supervisors and management to issue bus lane citations to motorists who illegally park, stop or stand in a designated bus lane or at a CTA bus stop, which also is a contributing factor to bus bunching.
CTA staff continually evaluate route performance on a daily basis by pulling global positioning system (GPS) and logical positioning system (distance-based) data collected through the automated voice annunciation system (AVAS) on each bus, as well as information from those buses currently equipped and activated on the Bus Tracker program.
Analysis of this data allows CTA field and planning personnel to identify trends and their causes (scheduling, ridership, route configuration, equipment failure, operator performance) and determine what can be done to help improve service reliability as quickly as possible.
In September 2007, prior to initiating any of the new measures, 4.5% of all CTA buses recorded instances of one-minute or less between buses (bus bunching). One month later, when some of the new initiatives were implemented, there was an immediate but moderate decrease in bus bunching to 3.9%.
Thereafter, the percentage of bus bunching remained steadily below the four-percent mark with an average of 3.4% for the period of September 2007 through April 2008. For the month of March, CTA saw the lowest reported percentage of bus bunching across the system with 2.8%.
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