There are so many things stated in the new law and the fines are ramped up to generally be a multiple of minimum salary.
Many of the rules stated in the law will take a very long time to implement imo........colors of public vehicles for example. In theory Uber would not be able to operate with these rules as another example. But they will no doubt be applied randomly.
And the rules for foreigners has changed but not sure what it all means (Art 207).
http://www.poderjudicial.gob.do/documentos/PDF/novedades/NOV_ley_ley_no_63_17docx.pdf
Best advice is to drive cautiously with all the documentation, respect the rules of the road that you were told when you got your local license and any signs and signals and don't drink and drive. And have the triangle at least in your vehicle.
Oh and it won't be AMET stopping you......it will be INTRANT.
And if you take a moto concho make sure he gives you a safety helmet!