If driving, slow down, use your headlights, and leave plenty ofdistance ahead of you.
* WHAT...Visibility less than one quarter mile or less in densefog.* WHERE...Delaware, Philadelphia, Western Chester, EasternChester, Western Montgomery, Eastern Montgomery, Upper Bucksand Lower Bucks.* WHEN...Until 10 AM EDT this morning.* IMPACTS...Hazardous driving conditions due to low visibility.