"Although approximately 450,000 people now drive for Uber, there are 210 million licensed drivers in the United States -- and an estimated 4.2 million adults who drive impaired, the study says."
And I love the numbers with no context. Are these 4.2 million people driving drunk daily? Weekly? Monthly? Ever?
You can't simply compare total numbers of drivers or even drunk-drivers versus that of Uber drivers. A single Uber driver can service *many* customers. This is basic logic, which seems to escape some.