I'd like to ask, when renting a car in Germany, does the prepaid amount include the car rental fee and the deposit ?

The money is a deposit, and then the car will be re-entered into your rental amount after returning the car. I used to be like this before with sixt. The pre-authorized amount will not be credited and will be refunded. Sixt should deduct the money after returning the car, and now what you swiped should be a deposit. You should ask what this fee is. I haven't seen this before. Well, it's good to ask clearly when returning the car. Sixt should not overcharge, at least I haven't been overcharged every time. Check the contract terms against the amount again. It's a sign, round, with 100 written on it, which means the speed limit is one hundred. There's usually a 10% buffer. Generally, there's no speed limit on the expressway, but the minimum is 100. Some sections have speed limits for safety reasons, just follow them. That's right, it might be because of construction, it will be reduced to 80. It depends. The large section of A5 to the south has no speed limit, you can speed up to 200. A3 may have a lot of cars.