There is no train station in Morella, so the only available public transportation is the bus. However, a car will be very useful to explore the region of Els Ports and El Maestrat at your convenience.
Keep in mind however that this is a very mountanious region and some local roads are narrow and winding.
As Morella was built on a hill, some streets are very steep. In order to make the climbing easier, some streets have steps.