Google Self-driving Car Strikes Bus on California Street - Bloomberg Business

Surprising that bus-related rule wasn't part of the system from day 1

"Google cars have been involved in nearly a dozen collisions in or around Mountain View since starting to test on city streets in the spring of 2014. In most cases, Google's cars were rear-ended. No one has been seriously injured.
Google's written statement called the Feb. 14 collision "a classic example of the negotiation that's a normal part of driving — we're all trying to predict each other's movements."
Google said its computers have reviewed the incident and engineers changed the software that governs the cars to understand that buses may not be as inclined to yield as other vehicles."

Google Self-driving Car Strikes Bus on California Street - Bloomberg Business