IMO - Hit and run deserves at least an equal punishment as DUI. I understand that it can be dangerous to stop at the scene, where locals could get nasty, but in that case the driver should report to the police as soon as possible.
I know this location very well. It is a recently constructed and incomplete part of Sukhumvit road (highway 3) basically an urban motorway with (apparently) 5 lanes in each direction. Although there are not yet any lane markings, and street lighting is very poor .
I don't offer any excuses for a hit and run driver, but I do believe that it is unwise to construct such motorways which allow very fast and very slow moving vehicles to share the road.