Continental AG says it has successfully tested vehicle-to-vehicle communications links that would inform motorists of potentially hazardous road conditions. In a statement, the German supplier said it had tested the communications system in Shanghai with Huawei Technologies Co. Each vehicle was equipped with a modem that enabled it to transmit road conditions -- such as a stationary vehicle warning or emergency brake lights to nearby vehicles via the cloud. As automakers introduce self-driving cars, a vehicle-to-vehicle linkup would broadcast each car’s location to other vehicles in the area.