In many ways car share schemes are a glimpse into what a fully driverless car future will look like.
For most of us, instead of owning our car we will simply recruit the nearest driverless car to give us a lift to where we want to go. This is not to say that a driverless car utopia will be like one giant car share scheme (it will be a giant taxi service ), however, car share schemes do provide a model of a society where consumers don’t have to own their own car and that’s what we’re interested in looking at here.

juliesbicycle.com
What Are Car Share Schemes?
In my city car share schemes park their cars in designated bays in car parks, scheme members can unlock the car with a smart card and proceed to drive the car. The evolution of payment for car share schemes is quite intriguing. Nearly all schemes requite customers to pay an hourly rate, but the specific vary quite a lot. Many schemes require either a joining fee, security deposit and/or insurance payment, conversely, some schemes charge monthly fees or direct debit your account. One similarity I’ve noticed between schemes is discounting for higher joining/monthly fees or bulk purchases of car usage time. We predict that payment for these schemes will evolve to be highly similar to mobile phone plans, maybe with a minimum monthly spend.
No Future For Car Sharing?
Oblivion. In the medium to long term anyway. Even now, car share schemes haven’t been able to compete with public transport. In the future, the introduction of widespread driverless car taxis, no-one will want the hassle of share car joining fees when they can rent a cheap, safe driverless car. So in its current form, car sharing will die.
However, car share scheme companies may not go the way of the dodo. When driverless cars first come in, car share companies will have prime real estate to park the cars in easily accessible places as well as having a customer base ready to try an alternative mode of transport.
Car Sharing Predicts Car Ownership In A Driverless Car ‘Utopia’
The main reason I’ve been looking at car share schemes is that they reduce the need for car ownership which is the same predicted effect for driverless cars. For most of us our cars are parked 90% of the time, so it will be much easier to rent a driverless taxi than shoulder the costs of buying a car, paying for fuel, registration, insurance, upkeep and so forth. Currently there are about 240 million registered cars, vans and motorcycles on the USA’s roads and I’m interested in trying to estimate how far that number will fall with the introduction of driverless cars.
Looking at the academic research on this subject there is an interesting, freely available paper on how car sharing affects car ownership in the US and Canada. This paper claims that for every share car between 9 and 13 cars are taken off the road. Let’s average this and call it 11 cars. So to perform a crude extrapolation to take all of the USA’s current fleet off the roads about 22 million share cars would be required – a 90% reduction. This is in line with the thinking that if we don’t use our cars 90% of the time we will need 90% less cars.
The psychology behind car share members getting rid of cars is quite interesting. Just because people became members of car share schemes didn’t mean they suddenly abandoned their personal vehicles. Intriguingly, the bulk of those getting rid of a vehicle were those who were already single vehicle households, suggesting to me that car sharing really only pushes people who are already considering going car-less. However, athough the average American household has nearly 3 cars, I was surprised to find out that about one third had only one car. For the entire survey the vehicles per household dropped from 0.47 to 0.24. As such the willingness amongst the American population to shed their excess vehicles when driverless cars become widespread is quite a real possibility.

From servicingstopmercedes.co.uk
Summary
So while car share schemes are not a perfect model for how driverless cars will change society, they do show that people are willing to pay for rental cars that are more expensive than public transport. Once consumers start using car sharing schemes they are more likely to shed their personal vehicles, perhaps even 11 vehicles per share car, particularly if they are in single vehicle households.
Extrapolating this to a future driverless cars are more competitive than car share schemes I predict car numbers will drop to about 1 car for every 10-15 people. In today’s terms that’s between 20-35 million driverless cars on American roads.