Dell, for example, with 21,000 employees, has an average of 913 employees per cell. Minibuses could also carry riders from a TC to a cluster of small employers. Taxi-vans could carry riders to isolated small employers.
Riders can board without paying a fare.
Go from home to a TC and from there to a hub by express bus. The rider transfers at a hub to another express which goes direct to a large employer. Taxi-vans could carry riders from the hub to isolated small employers. Go from home to a TC and from there to a hub by express bus. Go from hub to a TC near their final destination and then transfer to another bus or van for the last 3 miles.