Agree that driving in any of the cities I know reasonably well is awful, and not just at peak times.
However, most cities that are big enough to be so seriously congested tend to have some form of metro / tram / light rail system that is probably better and vastly cheaper than a drone for getting where you need in a reasonable time.
And there's always walking or cycling for the shorter trips!
Non-polluting and good for you (apart from breathing in the fumes).
FBW