Driverless Cars & Commute Times

Let's Go LA

One of many unknowns with driverless cars is what their impact on traffic will be. Boosters have predicted that driverless cars will reduce traffic by reducing the number of vehicles needed to serve travel demand and reducing following distances between cars. Detractors have predicted that these effects will be more than offset by latent demand for travel that will come out of the shadows when it gets easier to travel in a car, by being cheaper or less stressful, which will encourage people to travel more and longer distances.

We may be getting ahead of ourselves since we don’t know when true driverless cars will become available and achieve a large enough market share to have a big difference. However, it is worth considering what we can learn from differences in commuting time by travel mode.

The graph below presents the mean commute time for various travel modes for ten…

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