The National Highway Traffic Safety Administration on Thursday intensified its inquiry into Tesla’s self-driving system, after several crashes were linked to the innovative technology. 

The auto regulator, which operates under the Transportation Department, is evaluating how effective the self-driving vehicles are in ​identifying degraded road conditions through an engineering analysis. The government’s probe of Elon Musk’s company focuses on Tesla’s “degradation detection” system, which is designed to recognize ​when visibility is impaired ⁠and warn drivers to take control, according to Reuters.