But on the other hand, autonomous cars could allow for emissions reductions by enabling more
efficient driving patterns, without repeated acceleration and braking, plus vehicles traveling closer together benefit from improved aerodynamics.
For example, we can look at household
driving patterns: While total vehicle miles traveled have increased 16 percent between 1991 and 2001, there is no evidence that owners of hybrid vehicles
drove twice as much just because their cars were twice as
efficient.