What must I do after I scratched another car that was parked improperly in a narrow alley?

The liability in the collision of a moving car with a stationary car in a narrow road is likely to be on the owner of the stationary car for exceeding his right by parking, or it could be shared between them due to the negligence of each. A narrow road is one where there is not enough space left for another car to pass. Some scholars have gone to the extent of saying that parking a car in a wide space is not considered an infringement. In these cases, it is obligatory to refer to the authorities responsible for estimating traffic accidents to determine the at-fault party and the proportion of error. If these authorities decide that the liability is entirely on you or shared, then you must abide by that.