Open car
Some cars have those removable tops on them or the tops of the cars go back so it has no roof, which are called convertibles . As the car can change from closed top (roof) to an open top (roof).
You go in the luggage car and the hatch on top is open. Go on top.
yes
Sounds like a convertible with the top down or an open roadster.
ringpull
A pie with no top crust is called an open-faced or open-topped pie.
A 4 or 6 passenger open car used to be called a touring car. A two seat inside and one on the trunk outside is a rumble seat.
A pick-up roadster.
A closed sandwich has a piece of bread on the top, whereas an open sandwich does not have the top piece of bread.
A car that has a removable top is called a convertible. More often than not, these cars are sport cars.
It is usually called a landing.