The driver should observe the speed limit because the roads are equipped with hidden machines that measure the velocity at which the car is moving. If the velocity is above that permitted, the machine will take a picture of the plate. The ticket will be sent by mail. Police also stop people for speeding, and will want to see a driver's license, an ID, and the car's registration. Drivers without these documents risk having the car confiscated.
Cars run on diesel, gas or alcohol.
Mixing these fuels can ruin the car, so be sure to establish what kind of fuel a particular car takes at the time of rental.