Description:
A bus-only route separates the busses from other traffic. This can be for coaches arriving at the terminal to collect or drop off passengers. You could also have bus-only routes from offsite carparks such as long stay.
Why it should be implemented:
It would make for a cleaner look and also keep busses separate. Most airports that I have been to would have these.
Images, references or additional content:
Liverpool John Lennon Airport
Stansted Airport