A Rape Van
A sheebeen.
Un taxi (masc.)
taxi woman driver,
taxi man driver
Surprise, surprise - it's called a taxi. It's also called a cab.
You can turn in an unlicensed contractor to the building inspector in your area. There are departments in every city or town that handle this. Usually it is called the office of building inspecting and permits.
In Britain, taxis are commonly known as "black cabs" or "hackney carriages", especially in London. Private hire vehicles (PHVs) are called "minicabs", which must be pre-booked. For a reliable taxi service in the UK, check out CabHit!
You just reported an unlicensed builder - get out of here!
So they can be easily identified as taxis. They can also be more visible from a distance, and it makes it harder for unlicensed cabs to operate. If you were to take just any car and add some magnetic signs calling it a taxi, and it is not yellow, it would be spotted immediately as an illegal cab.
A rickshaw
Fare
Coins or papers