When renting a car in Karlsruhe, you will typically need to present the following documents:

• A valid driver's license from your country of residence.
• A valid passport or ID card.
• A credit card in the name of the primary driver for the security deposit.

It is important to check with the specific rental company for any additional document requirements.

Most car rental companies in Karlsruhe require a credit card for the security deposit. This is because the credit card provides assurance to the rental company in case of any damage, fines, or theft of the vehicle. However, some rental companies may offer alternative payment options such as prepaid cards or cash deposits. It is recommended to check with the specific rental company for their payment options.

The fuel policy for rental cars in Karlsruhe may vary among rental companies. The most common policies include:

• Full-to-full: You will receive the car with a full tank of fuel and you are required to return it with a full tank.
• Pre-purchase: You will pay for a full tank of fuel at the time of rental and you can return the car with any amount of fuel left.

It is important to clarify the fuel policy with the specific rental company before renting the car.

Yes, you can drive the rental car outside of Karlsruhe, but it is important to inform the rental company about your travel plans. Some rental companies may have restrictions on driving their cars outside of certain areas or countries. It is also important to check if there are any additional fees or requirements for cross-border travel.

If you return the rental car late, you may be charged for additional hours or even an extra day, depending on the rental company's policy. Late fees can vary, so it is important to check the terms and conditions of your rental agreement. It is recommended to return the car on time to avoid any additional charges.

In case of an accident or breakdown, you should immediately contact the rental company's emergency hotline or the local authorities, depending on the severity of the situation. The rental company will provide you with instructions on what to do next, such as arranging for a replacement vehicle or arranging for repairs. It is important to follow their instructions and report any incidents as soon as possible.