What should I do if my car without a license plate is towed away by the traffic police?

This matter was not complicated at first. But your dad's actions did constitute obstruction of law enforcement. There is also a legal basis for detention. From your narration, I know that after someone said it, fifteen days was changed to five days, which shows that it is flexible. If your dad apologizes to the traffic police again and admits his mistake, and your friend talks to your dad again and gets the traffic police officer involved to agree, he may have a good attitude of admitting his mistake. If the circumstances are minor, he will be exempted from punishment and not detained. As for the problem of not having a license plate, this should be dealt with at the same time. If you have a driver's license and a car, you can reissue it. Unless the second-hand car you buy is a stolen or scrapped car, there is no way to get it registered. What do you think?