B (AC Transit)

B
Overview
Operator	Key System (1906–1960) AC Transit (1960–2020)
Began service	1906 (1906)
Ended service	2020
Route
Locale	Oakland, San Francisco
Start	Lakeshore Ave. & Longridge Dr.
Via	Longridge Dr., Trestle Glen Rd.
End	Salesforce Transit Center
Timetable	B
Map	B
Route map ← A  List of AC Transit routes  C →

The B was a bus service operated by AC Transit in the San Francisco Bay Area. It is one of the operator's many transbay routes, which are intended to provide riders a long-distance service across the San Francisco Bay between the East Bay and San Francisco. The service was descendant of a Key System streetcar and ferry line that operated prior to the formation of AC Transit. The line was suspended in response to the COVID-19 pandemic.