Of course, the self-driving cars weren't able to give each other the finger after it happened.  Auto parts maker Delphi says that its experimental self-driving car was on a street in Silicon Valley earlier this week and was moving into another lane when an experimental self-driving car from Google cut it off by moving into the same lane.  Delphi disclosed the incident to a Reuters reporter earlier this week and confirmed it to CNNMoney Friday. Spokeswoman Kristen Kinley insists it wasn't truly a near miss but was instead an example about how self-driving cars effectively avoid accidents.  "Our car saw the Google car move into the same lane as our car was planning to move into, but upon detecting that the lane was no longer open it decided to terminate the move and wait until it was clear again," she said.  Google agreed with Delphi's take on the incident.  "The headline here is that two self-driving cars did what they were supposed to do in a fairly ordinary everyday driving scenario," said a spokeswoman.  Related Google's new self-driving cars hit the road  Self-driving cars are allowed on streets and highways in California, but they are required to have a human driver sitting behind the steering wheel able to take over control of the car if there is a problem. The cars are not yet for sale to the public. The self-driving vehicles now on the roads are being used by companies that are developing the technology.  Self-driving cars are still rare, they're becoming more common on the streets near Google's Mountain View, Calif, headquarters. Google has 23 self-driving Lexus RX450h crossovers on the road, and recently put nine prototypes of its own self-driving car design on the road as well. Delphi, which recently drove a self-driving Audi across country, does most of its test drives near its autonomous driving lab, which is near to Google's headquarters.  Self-driving cars have been involved in a number of minor accidents with traditional driver cars during the last few years that they were being tested on the road. Google has driven the cars more than 1 million miles in autonomous driving mode. It says it has had 12 accidents. Most occurred when the autonomous driving car was stopped or nearly stopped and were struck from behind by a car with a driver.  There was a human driver sitting behind the wheel in all the cases, and in instances where the car was in motion when the accident occurred, the human driver took control of the car.  Related: Americans are warming to self-driving cars  CNNMoney (New York) June 26, 2015: 1:33 PM ET
Self-driving Google car cut off self-driving Delphi car on California street earlier this week but cars were able to avoid an accident.