Electric might not make gridlock go away, but a sufficient majority of self-driving cars could. If all the cars talk to each other and use the existing road space much much more efficiently then you could have the same number of cars (or even more) on the same roads with none of the traffic issues. Imagine a smooth flow of closely bunched vehicles, all acting in collectively the most efficient way possible to get where they need to go. Compare that with the relative inefficient chaos we have today. Capacity would massively increase without building any more roads. In fact huge multi-lane roads could become superfluous. ---------------------------------- I actually think the main thing that will drive electric car sales over the next 2 decades or so is price. Electrical engineering has been show repeatedly over the years to reduce in price (and thereby increase in performance) at a much more rapid rate than mechanical. An electric car is inherently much simpler than it's internal combustion engined counterpart. I have a feeling many of the qualms about going electric will dissipate if they're half the price for similar performance and by 2040 it could be something of a non-issue.