Why is it necessary to use three tiers? Did Avon consider a two-tier transportation system?

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Depending on the level, between 60 and 80 percent of Avon’s 10,000 students rely on our fleet to get to and from school. Operating in three tiers would allow us to transport students using fewer drivers because all drivers would be able to drive three tiers. Even before the pandemic, finding enough CDL-licensed bus drivers was a challenge and shows no signs of improvingA three-tier system allows us to decrease the number of CDL-licensed drivers while phasing out the older buses in our fleet in a timelier manner.