Monday to Thursday: every 15 minutes
Friday: every 15 minutes
Peak Period: every 7½ minutes
Evenings: every 15 minutes
Saturday: every 7½ minutes
Sunday: every 15 minutes (reduced service before noon)
From Broadgate via Ironmonger Row, The Burges, Bishop Street, Radford Road, Beake Avenue, Penny Park Lane and Nunts Lane to purpose-built terminus at the junction with Wheelwright Lane. Probable terminus details from road layout:
Service introduced June 1958, Fare Stages unknown.
King Street, Lydgate Road, junction of Beake Avenue with Radford Road, Links Road, Burnaby Road, Headington Avenue and junction of Nunts Lane with Penny Park Lane.
Service 15 introduced as a new service from Broadgate to Whitmore Park via Cross Cheaping/The Burges, Bishop Street, St Nicholas Street, Radford Road and Beake Avenue, terminating at Headington Avenue.
Service extended along Beake avenue to Malmesbury Road.
Further extended along Beake Avenue, Parkville Highway and Nunts Lane to the Junction with Wheelwright Lane.
Northbound services diverted from The Burges via Hales Street and Trinity Street by new one-way system.
Introduced as Outer Circle tour on Summer Sundays and Bank Holidays., but discontinued after 1939, presumably because of the outbreak of war.
Service 15A introduced to run along the Coventry Bypass between the Browns Lane factory and Ryton/AWA. However, after a short time the service became an unnumbered works service.
Summer Outer Circle tour recommenced, but it is not known whether or not this was numbered as Service 15, nor when it was discontinued.
During the holiday period and on Sundays an Outer Circle tour of about 35 miles was established. ; It has not been possible to establish when the previous Outer Circle was discontinued, nor whether the new one was numbered Service 15.