Some think it will not happen in a significant way at all.

My position has been and remains, driverless vehicles will be widespread before the end of this decade.

Automated vehicle pilot projects will roll out in the U.K. and in six to 10 U.S. cities this year, with the first unveiling projected to be in Tampa, Fla. as soon as late spring. The following year, trial programs will launch in 12 to 20 more U.S. locations, which means driverless cars will be on roads in up to 30 U.S. cities by the end of 2016. The trials will be run by Comet LLC, a consulting firm focused on automated vehicle commercialization.