According to Houston Police spokeswoman Jodi Silva, a driver traveling south on the freeway lost control of his car around 2:45 a.m., crashing into another vehicle. A person in a Prius driving down the freeway saw the motorist step into the roadway and slammed on his brakes, which caused another person in a BMW behind to hit the Prius and swerve into the person standing in the freeway, Silva said.