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October 03, 2013  |   Comments (0)   |   Post a comment

District cuts vehicle breakdowns by 50%, crashes by 35%

By Jack Chavdarian


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Prince William County Public Schools began buying buses with disc brakes, which Director of Transportation Services Ed Bishop says improved braking and saved money on maintenance.Photo courtesy Thomas Built Buses.

Prince William County Public Schools began buying buses with disc brakes, which Director of Transportation Services Ed Bishop says improved braking and saved money on maintenance.
Photo courtesy Thomas Built Buses.

Investing time in maintenance and money in better equipment for school buses has not only improved the performance of Prince William County Public Schools’ fleet, it has cut costs significantly.

The fleet, composed of 850 Thomas Built route buses, serves 93 schools and transports about 61,000 students daily, according to Director of Transportation Services Ed Bishop. The drivers log an estimated 11.3 million miles per year.

Cutting costs started with examination of data from a crash review board. The operation wanted to determine if bus design or maintenance had an impact on the numbers or types of crashes taking place. Data from the maintenance management system were also studied to see where the biggest expenditures were, and what types of common faults were being experienced.

The fuel management system was next on the list; fuel consumption data for every vehicle in the fleet were observed to identify any abnormalities that caused expenses.

As a result, four areas were identified where significant costs were cut: major component replacement on mostly engines, expenditures on tires, expenditures on batteries and expenditures on brakes.

Engines were put through an internal fuel management program where fuels were sampled and tested to determine which fuel resulted in the least wear and tear on the engine. Then other parts of the bus that add to engine wear and tear were inspected.

“We just took a look at simple things, such as the quality of fuel filters, oil filters and air filters,” Bishop said. “We thought that if we were able to improve these filtering processes then that would also give us a cleaner-running engine.”

Fuels and parts were then adjusted to better quality ones. This reduced the number of engine breakdowns and replacements, drastically cutting costs on usual engine repairs.

It was also discovered that a significant amount of avoidable expenses were due to tire replacements.

“We looked at the tires and said, ‘Wow, we sure spend a lot of money on tires. What can we do to improve that?’” Bishop said.

The fleet started a tire management program where tire pressures were maintained properly. Driver training programs were adjusted as well to make sure drivers weren’t damaging tires by scraping curbs or hitting them.

Also, buses were bought with disc brakes to improve brake life cycles.

“We found that not only improved the braking of our buses, but changed the frequency with which we had to replace brake linings and the time required to do so,” Bishop said. “You spend an extra $1,500 [buying a bus with disc brakes versus conventional brakes], but over a 14-year life cycle, you save thousands.”

Higher-quality batteries and alternators were purchased, and the number of situations where buses wouldn’t start because of battery issues was cut by at least 50%, Bishop added.

With the help of Thomas Built dealer Sonny Merryman, a predictive maintenance program was developed to track breakdowns. Measures were taken to avoid them, their costs and their negative impact on student instructional time. Vehicle breakdowns were reduced by 50%.

As an example, buses would often have to pull over and call for service because a signal light or other bulb wasn’t working. “An analysis of these breakdowns caused us to invest in LED lighting at a higher acquisition cost per bus, but in the long term, it reduced the total cost of ownership of the bus and increased instructional time,” Bishop said.

Also, the district’s crash numbers are down by 35% and are being reduced every year. This has been aided by the predictive maintenance program but is primarily a result of improvements in  driver training programs, enforcement of safety standards and bus routing.

Bishop joined Prince William County Public Schools more than 11 years ago, after retiring from a 30-year career of service in the U.S. Army. He credits his staff for the success of the district’s fleet, especially Vehicle Safety Coordinator David Walton, who is primarily responsible for the effective cost-cutting programs.

The most important part of these improvements was that students didn’t miss class because buses were breaking down on them, and that they arrived to school safely, Bishop said.

“Bus acquisition, preventive maintenance services, unscheduled repairs, etc., is all focused to achieving those top two goals,” he added. “Our breakdown rate has gone down, our crash statistics have gone down, and that means maximizing instruction time.”


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