To help understand the problem, we gathered data for buses and depots for different size cities.
City Size | Buses | Routes | Depots | Avg bus per depot |
Medium | 435 | 82 | 26 | 17 |
Large | 1193 | 125 | 10 | 119 |
X-Large | 2356 | 267 | 18 | 131 |
As can be seen above the style of a depot can vary. In larger cities depots are consolidated and have a higher density of buses per depot. This is just a snapshot of cities and exact numbers would be needed for deployment at a city level.