The CPUC requires that all carriers have a preventive maintenance program and maintain a daily vehicle inspection report, Prosper said. Carriers also certify that they are have or are enrolled in a safety education and training program, she said.

Prosper said requirements for emergency exits only apply to buses, and limousines are not required to have fire extinguishers.

U.S. Department of Transportation data shows five people died in three separate stretch limo accidents in 2010, and 21 people died in another three stretch limo accidents in 2011.