Google's driverless car could ultimately cause a decline in car ownership in the U.S.

The growing levels of comfort of driverless cars and the rise of ride-sharing programs could combine to cut private car ownership nearly in half, according to a recent study from the University of Michigan.

If Google’s fleet of self-driving vehicles became part of a growing number of Uber and Lyft drivers, or even supplanted them, the need for a second car is blunted, the researchers said, especially if a “return-to- home” mode is involved allowing the ride share vehicle to act as a form of shared family or household vehicle.

According to Michael Sivak and Brandon Schoettle at the University of Michigan’s Transportation Research Institute, the most recent U.S. National Household Travel Survey (NHTS) data shows a general lack of trip overlap between drivers within a majority of households, opening up the possibility for a significant reduction in average vehicle ownership per household based on vehicle sharing.

The pair notes that the cut in car ownership and the accompanying shift to vehicle sharing within each household, in the most extreme hypothetical scenario, could reduce average ownership rates by 43%.

The number of vehicles per household would drop from 2.1 to 1.2 vehicles, they claim. On the flip side, this shift would result in a 75% increase in individual vehicle usage: from 11,661 to 20,406 annual miles per vehicle.

(Google may be readying challenge to Uber and Lyft. For more, Click Here.)

That increase in mileage could be a godsend for automakers as it represents a significant cut the average lifespan of a vehicle from the current 11.4 years down to 6.5 years, meaning cars would need to be purchased nearly twice as often, offsetting the number of vehicles in each home.

(Click Here for details about how snowstorms impact self-driving vehicles.)

Sivak and Schoettle acknowledge that “given the number of current unknowns regarding sufficient gaps between trips, future self-driving-vehicle implementation, self-driving-vehicle acceptance, and possible vehicle-sharing strategies within households, these results serve only as an upper-bound approximation of the potential for household sharing of completely self-driving vehicles.”

(To see more about the new electronic stability control on the 2016 Ford Focus, Click Here.)

However, automakers such as General Motors, Audi, Ford, Nissan and Mercedes-Benz are all working furiously on some form of self-driving vehicle. Nissan and Tesla have said they’ll have commercially viable autonomous vehicles on the road by 2020.

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