Besides a lot of normal roads – sometimes in quite bad condition – there are also motorways on Cuba. Gasoline is very expensive for the local population and the people use busses and lorries for transport; in villages also horses and carriages. For tourists there is a special kind of gasoline available at the limited gasoline stations you should have on a map.
As always when I’m on unknown terrain I recommend to stop at a gas station when the tank is only half full. Because of the gasoline costs the motorways are always nearly empty – you’ll have three lanes for your own and most often you can’t see any vehicle around you. But that’s an advantage because you need the space to omit the holes in the surface.