Lightening The Commute

Other reasons to look forward to driverless cars – they would be both safer and greener:

Self-driving technology could greatly reduce the risk of accidents, leading to far-lighter cars and slashing fuel consumption and emissions by more than a factor of 10 in some cases. 

Tim deChant nods:

One reason fuel economy stalled for decades was the increased mass each engine had to haul around thanks to more stringent crash standards. Engines became more powerful and more efficient in that time, but they also had to do more work. Lighten the load and you’ll release all that pent up efficiency.