Generally, it is possible to enter on a working day (Mo-Fr), but not on weekends or public holidays. If you decide to enter on a Friday, you can only receive your necessary documents at the traffic administration such as provisional Chinese driving license and provisional number plate on the next working day (Monday, if Monday is not a holiday). As well, the vehicle check can only take place on that day. However, there are some exceptions. Some border can be crossed on a Friday and you can receive the necessary documents on the same day (not at borders in Xinjiang province).