Coventry Triangle Motor Club

Think it might be something to do with this.

4. Lydgate Road 1923 (Unknown) This interesting group of motorcyclists, members of the Coventry Triangle Motor Club, are seen turning left from Lydgate Road on to the Radford Road. They are taking part in the Coventry Hospital Carnival event, which took place on Saturday 9th June to mark the 50th anniversary of the Hospital Saturday Movement. The event which started from the Radford Aerodrome, Middlemarch Road, raised £2,888 towards the upkeep of the hospital, which was heavily in debt and due to its success became an annual event. From "The Coventry We Have Lost". Unfortunately, "members of the Coventry Triangle Motor Club" are not shown.