LOS ANGELES — Dense fog is shrouding much of the Southland this morning, making roadway travel treacherous and delaying flights at Los Angeles International Airport.

A dense fog advisory issued by the National Weather Service will be in force until 9 this morning in the San Fernando and San Gabriel valleys, L.A. County beach cities, metropolitan Los Angeles including downtown L.A., the Hollywood Hills, and parts of Ventura and Santa Barbara counties.

Flights are delayed at LAX due to low visibility caused by fog, according to media reports.

The weather service attributed the fog to a mass of moist air trapped beneath a ridge of high pressure.

The NWS said the fog is reducing visibility to a quarter-mile or less, creating dangerous driving conditions. In Los Angeles County, according to the NWS, the fog will make driving challenging on these freeways: the 5, 101, 118, 170, 210, 405, 10, 57, 60, 210, 605 and 710.

Motorists driving in the fog should reduce speeds, leave extra space between themselves and vehicles in front of them, use only low beams and give themselves extra time to reach their destinations, the NWS urged.

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