A dense fog advisory was released by the National Weather Service on Friday at 3:37 a.m. in effect until 9 a.m. for Western Chester, Eastern Chester, Western Montgomery, Eastern Montgomery, Upper Bucks and Lower Bucks as well as Berks, Lehigh and Northampton counties.

The weather service states to expect, "Visibility one quarter mile or less in dense fog."

"Low visibility could make driving conditions hazardous," explains the weather service. "If driving, slow down, use your headlights, and leave plenty of distance ahead of you."

Fog safety: Tips from the weather service for safe travels

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

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