The Fossa was a vehicle manufactured by HuCiv. This car was a cheap and reliable method of transportation. These vehicles were created on several different colony worlds.
The Fossa was one of the most common sedans used on Andesia. It was common to see them on the streets of both Noctus and Promesa.
The Fossa appears as a static object on the Halo 5: Guardians maps Urban, Battle of Noctus, Plaza and Overgrowth. It can also be placed as a Forge Object itself (with recoloring options) or it can be seen on a billboard advertising it.