If you travel to Formentera with a vehicle or motorcycle from outside the island in high season (from June 15 to September 15, both included), you must reserve a place here Booking website to drive in Formentera
After requesting authorization, on the same website you can check the status of the entry authorization with the registration number.
You also have the option of renting the vehicle or motorcycle in Formentera and you will not have to carry out these steps.