An anonymous reader writes: Ride-share companies like Uber, Lyft, and Sidecar got letters from the California Public Utilities Commission this week telling them that carpool features for their services are illegal. "Basically, the CPUC says that under California law it's illegal for these ride-sharing services to charge passengers an individual fare when carrying multiple people in one vehicle. If the companies would like to add a carpool feature, they first have to request an adjustment to their existing permits with the CPUC or petition the state legislature to modify the law. Uber, Lyft and Sidecar all unveiled carpool features last month. The three companies say the feature lets strangers in multiple locations, but heading the same direction, share rides and split fares — saving passengers up to 50 percent per ride." This news arrives just as Uber gave in to the demands of striking drivers who claim the company is undermining their ability to earn a livable wage.