The dense fog is expected to significantly impact travel in the affected areas, including Southern Monterey Bay, Big Sur Coast, Northern Salinas Valley, Hollister Valley, and Carmel Valley. Visibility may drop to less than a quarter-mile in some areas, creating hazardous driving conditions. Sudden changes in visibility could lead to accidents, especially for those traveling at high speeds or following other vehicles too closely. Commuters and travelers are urged to remain vigilant and take necessary precautions to ensure safety on the roads.