Tesla unveils autopilot system, but don't let go of the wheel

By Alexandria Sage PALO ALTO, Calif. (Reuters) - Newer Tesla Motors Model S sedans will be able to steer and park themselves under certain conditions starting Thursday, the carmaker said, although Chief Executive Officer Elon Musk cautioned that drivers should keep holding the steering wheel. New "autopilot" features, designed for cars built after September 2014, will be available for customers in the United States, Tesla said. Tesla will provide the features through an over-the-air upgrade.