Excellent news for the gas-sipping, headlight-blinking, gossipy autos among us. Cadillac’s flagship 2017 CTS sedan will talk to other cars. Well, other 2017 Cadillac CTS sedans, but it’s a start. If the government gets its way, all cars will talk to each other one day soon. Engineers call the technology vehicle to vehicle communication. General Motors and Uncle Sam call it the future of automotive safety in a country where more than 32,000 people died