When renting a car, there are certain restrictions and prohibitions that you should be aware of. Here are some things you should not do in a rental car: You should not take your rental car off-road or onto unmarked roads. Speeding in a rental car can not only put you at risk of getting into an accident, but it can also result in additional fines or tickets. Most car rental companies prohibit smoking in their vehicles. Smoking in a rental car can lead to additional cleaning fees. Most car rental agreements specify the maximum number of passengers allowed in the vehicle. It is important to adhere to this rule as it can affect your safety. You are not allowed to leave the country without the permission of PBI car rental.