The penalty for this case is very small and should be around 1000 baht, but if the accident results in the injury or death of the other party then there will be a criminal charge of up to ten years imprisonment. At the same time a civil case will also be opened with the charges being the cost of damages such as medical fees, work compensation, vehicle damage and in the case of death a funeral fee. With things like traffic accidents sometimes you are in the right, on the main road and then crash into someone coming out of a side soi. Yes, they are negligent and came out of the soi carelessly and the accident was caused by them. But one thing is that they are the person who was hurt by the accident, by law you do not need to pay them anything and you will not be charged. But in Thai culture and because of the situation of the less fortunate here, there will be no one able to help them. That is why the police or the family of the injured will ask you to help them to get better faster meaning you pay them some money to spend on their health and life.