The phrase "door saloon" refers to a type of car with four doors and a relatively smaller size. It is often used to describe a compact or mid-size sedan vehicle. Full definition
It's impossible to ignore that this is a four - door saloon SUV, a type of car that few manufacturers have attempted and even fewer, if any, have succeeded with. (evo.co.uk)
Now, though, the coupe and convertible models are known as M4, while the M3 is available as a four - door saloon only. (carbuyer.co.uk)
The vehicles used in the series are loosely based on road - going, four - door saloon cars. (en.wikipedia.org)