We already have cars that sit there idling by themselves forever; I for one am looking forward to driverless cars. Imagine, say you don't want to go to work for whatever reason, you can still send your car there... it can go through some drive-thru at lunch time... then it can come home again! It doesn't tax the imagination too much to envision cars that are smarter than drivers; then I think the proper thing to do is enable the cars to decide when and where they want to go.
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