Like any other country, should this happen to you, you should call Najm at 9200 00560. This is the legal way and you are protecting yourself. Your car should always be insured. Never negotiate with the other driver about paying them for damages. Let the insurance deal with it. That’s why you pay for it. Driving a noninsured car is a crime. Just get your pics of the damages and license plates, exchange driver’s license info and call Najm at the time of the incident and at the place. Najm will not help you if you leave the incident and if the other car has your picture, then it can be reported as a hit and run which is a bigger issue. To make things easier, always have wifi on your phone. Najm also has an app which makes reporting an incident much easier with the maps, location services and getting pictures. Here is their number 920000560. Hopefully, you never need it.
https://www.najm.sa/en/post-accident-procedures