It's hard to read, but the driver was cited for "Driving with Monitor visible to Driver (Google Glass)" (Source: Google+)

This May Be The First Ticket For Wearing Google Glass While Driving

California law prohibits drivers from operating a vehicle when some sort of video screen is showing “entertainment or business applications” that are in the front seat area or otherwise visible to the driver. And at least one police officer in San Diego thinks this law applies to Google Glass. [More]