On Saturday at 3:39 a.m. a dense fog advisory was issued by the National Weather Service in effect until noon for 5 Freeway through Grapevine.
The NWS Hanford CA states to expect, “Visibility down to quarter mile or less in dense fog.”
“Low visibility could make driving conditions hazardous,” the NWS said. “If driving, slow down, use your headlights, and leave plenty of distance ahead of you.”

Navigating fog: Safety tips by the NWS
When a dense fog advisory is issued for your area, it means that widespread dense fog has developed and visibility can plummet to a quarter-mile or less. These conditions pose challenges for travel, so exercise extra caution on the road or consider postponing your trip if possible.
If you must drive in foggy conditions, keep the following safety tips in mind:
Moderate your speed:
Slow down and allocate extra time for your trip to reach your destination safely.
Visibility matters:
Ensure your vehicle is visible to others by using low-beam headlights, which automatically activate your taillights. Utilize fog lights if your vehicle is equipped with them.
Avoid high-beams:
Refrain from using high-beam lights, as they create glare, making it more difficult for you to see what’s ahead of you on the road.
Keep a safe distance:
Maintain a generous following distance to account for abrupt stops or shifting traffic patterns.
Stay in your lane:
To ensure you are staying in the correct lane, use the road’s lane markings as a guide.
Zero visibility protocol:
In situations of near-zero visibility due to dense fog, activate your hazard lights and seek a secure location, such as a nearby business’s parking lot, to pull over and come to a stop.
No parking options:
If no designated parking area is available, pull your vehicle as far off the road as possible. Once stationary, deactivate all lights except the hazard flashers, engage the emergency brake, and release the brake pedal to ensure your tail lights are not illuminated, reducing the risk of other drivers colliding with your stationary vehicle.
By adhering to these precautions from the NWS, you can navigate foggy conditions more safely, reducing the likelihood of accidents and ensuring your personal safety.
For more local weather alerts, visit our Weather Advisory page