"bus network" is a correct and usable phrase in written English.
Example: The city's efficient bus network connects all neighborhoods to the downtown core, making it easy for residents to commute to work.
Guernsey's bus network serves all of the island's major attractions.
"The bus network is the staple of outer London.
Since TfL was created in 2000 London's bus network has been pumped with cash.
Half the container fleet runs like a bus network with regular sailings at set times.
His congestion-charging scheme has reduced traffic snarl-ups, and he has revitalised the bus network.
Getting around A bus network connects the major towns and resorts.
"The night bus network keeps London cleaned, entertained and in business for tomorrow morning.
But Cobb's bus network bypasses much of the county and does not run on Sundays.
Each year 980m passengers are carried around on its British bus network.
The city has a fairly extensive bus network, and taxis and rickshaws are easily accessible.
The night bus network has been transformed in the past decade.
