In most cases it is recommended to slope concrete driveways by at least 1% (or 1/8 inch per foot) to provide effective drainage.. Planning The success of a finished driveway starts with good planning. However if you have heavy vehicles (such as vans or motorhomes) then you should consider at a minimum thickness of 5 inches. You need to make sure you identify your driveway requirements and understand what you need before you approach any professional driveway contractors. 

Thickness - the