SAN FRANCISCO (KGO) -- San Francisco Mayor Daniel Lurie is calling for new statewide standards governing autonomous vehicles during major events and emergencies after traffic gridlock involving Waymo vehicles during the city's Fourth of July celebrations. In a letter to California's transportation secretary, Lurie urged stronger regulation of autonomous vehicles following congestion in San Francisco on July 4 and during a citywide power outage in December. More than 100,000 people came to San Francisco for Fourth of July fireworks festivities. RELATED: July 4 Waymo gridlock in SF after dozens choke streets, some lose power, 1 ran over lit fireworks According to the letter, much of the traffic disruption was attributed to Waymo vehicles and gaps in existing state oversight. The letter said the incident "demonstrated that California's current regulatory framework does not adequately address how autonomous vehicles operate during major incidents, planned or not." Some residents have called for Waymo vehicles to be kept off the streets during large events. Lynnet Spiegel, who said she was stuck behind six Waymo vehicles during the holiday, said, "They definitely should not be around when there's big events happening because it just screws up the whole entire city." MORE: 3 Waymo self-driving cars in 'standoff' cause traffic jam in San Francisco Bryant Walker Smith, a law professor and transportation technology scholar, said restricting autonomous vehicles during major events could be a short-term solution in some situations but not a permanent one. "You need to be able to get that janitor home in the middle of the night. You need to be able to get that emergency room technician into the hospital, and simply saying it's too hard. Sorry, we'll see you when things work better actually isn't an option," Smith said. Lurie also said that during the July 4 gridlock, "reports indicated that