If you read around, the industrial park appears to be a mini F1 track on the weekends. Lets say the accident report comes back to just a loss of control by the driver. Blaming just Bott's dots for hydroplaning seems a little far fetched to me. I would vote the driver ran over a patch of something that caused the loss of control. That something might be marbles from previous racing or something accidentally got spilled on the road like loose gravel or water. Google map shows a major housing subdivision under development just to the northeast of the accident site. If wind blew enough dirt and grime onto the roadway, that might have been enough as well.
What is really lame is that these aren’t punk kids, they were rich guys who could afford track time at any of the awesome California road courses.