El Alto: DAB – Aduana Boliviana to arrange extension of car papers. Along the highway that leads through El Alto lies the DAB, nearby the airport (when driving in the direction of Oruro it's on your right hand side). Here you can arrange an extension of your car papers. The car is checked on its license plate and chassis, so don't go there without your car. Bring your passport and car papers, and make sure to have copies to hand over, as well as an official letter requesting this extension. The extension is free of charge (Jun '10).