Wow i hadn't even heard about this, but man i love Volvo. Always coming up with genius ideas.
Is this what you're referring to?
Volvo cars in Europe will be able to warn each other about hazardous road conditions – TechCrunch
Tesla's can't do that YET as
@edigest mentioned, but this is exactly the type of thing that is perfect for a future OTA Software Update (assuming no additional hardware is required, which it shouldn't be)