If you are over the legal limit & are stopped in a roadblock, you will be summarily arrested and have to appear in court. There are no options such as an admission of guilt fine.
If you’re found guilty of drunk driving in South Africa you could face up to 6 years in jail. You could also be liable for fines of up to R120 000 and your driver’s license may be suspended.
You will also have a criminal record which can have serious ramifications for the rest of your life. Of course, the worst case scenario is that you could kill someone else on the road, your loved ones or yourself.