”No collision took place.”
”In all cases, the self-driving prototype was not at fault, according to the California Department of Motor Vehicles and the companies.”
You're piecing together two unrelated sentences from the article to tell a different story...
"No collision took place" - refers to the two cars in this case.
"In all cases, the self-driving prototype was not at fault, according to the California Department of Motor Vehicles and the companies." - refers to previous crashes excluding the one being discussed in the article.
Source Article: http://www.reuters.com/article/2015/06/26/us-autos-selfdrivi...