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Self driving (and taxis) cars can reduce traffic, because commuters can combine them with mass transit (e.g. trains).

If a commuter travels more than 2 legs in a day, it's very likely that mass transit will not cover one of the legs and he will take his car.

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Yeah... I've been trying to do this and laughed at by my drivers (when it's them that are taking a long time to make it to the station).

in ATLanta

why would people do that when they don't already carpool or take a bus?

If I could press a button and have a car pick me up, take me to the train station, get on a train, and have a car waiting on the other side I'd choose that over the present litany of call a car, hope it arrives in time, get on the train, arrive at the station, wait around for a car. Many times I'm just too tired (or lazy) to do that, and call a car for the whole journey instead.

Same reason people who didn't take taxis take Uber.

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