Cadillac expects to include a "Super Cruise" function in its commercial automobiles as early as 2015, General Motors . A vehicle equipped with Super Cruise will be able to automatically steer, brake, and center itself in a lane during "optimal" highway driving conditions.

RELATED:

It's not quite the same as the completely car Google is going for, but it is closer to being publicly available. Current Cadillac models already include the building blocks for the Super Cruise function, and are able to automatically brake and adjust cruising speeds based on other vehicles nearby.

Super Cruise will only work in perfect weather conditions, though. According to Cadillac, certain weather conditions that hide lane markings or cause issues with GPS will force the driver to grab the wheel. So you can't while in Super Cruise -- not yet, anyway.

According to GM, the goal of Super Cruise is not to give customers a personal chauffeur.