Frow Wired.

http://blog.wired.com/cars/2008/07/worlds-first-fo.html

According to Volkov, eyewitnesses to the crash told him the Roadster had gone “unnoticed” because of its low profile and silent powertrain. “There was extensive recording, switching between police officers to compare notes – writing, writing, writing, more than I've seen in an average accident, especially because they couldn't believe the statements. They were trying to establish the fact of the car's unnoticeability.”