The phrase "are a common mode" is correct and usable in written English.
It can be used when discussing frequently occurring methods or approaches in a particular context, such as technology or communication.
Example: "In digital communication, packet switching and circuit switching are a common mode of data transmission."
Alternatives: "are a typical method" or "are a prevalent approach".
Ferries are a common mode of transport between more than 7,000 islands that make up the Philippines, where hundreds of people die in boat accidents every year.
One night, as Olivia is about to be struck by her stepfather, she temporarily finds herself in a different place; the next day, she draws in her sketchbook a picture of what she saw in the other place: a zeppelin (which are a common mode of transportation in the alternate universe).
In particular, motorcycle taxis are a common mode of transport in Lima, but drivers are often under-aged, vehicles are often filled beyond capacity, and they frequently violate traffic codes.
Rice based herbal porridges (kola kenda) are a common mode of ingesting herbal extracts in Sri Lanka.
Glenoid loosening is a common mode of failure after total shoulder arthroplasty (TSA).
Hydrogen-atom transfer from an organic molecule to a suitable acceptor is a common mode of organic oxidation.
The Fiber-Tear-Failure (FTF) is a common mode of failure in the adhesively bonded single lap joint having continuous fiber reinforced composite.
Metal matrix composites are mostly used as such structural engineering components where solid particle erosion is a common mode of failure.
Objectives: Hanging is a common mode of suicide in India, but there is paucity of MRI and neurophysiological findings in the context of clinical and neurological changes.
In New York, Twitter is a common mode of communication between youth gangs, said a Harlem pastor, Vernon Williams, who monitors the online messages of various "crews" in an effort to head off potential wars.
