Which of the following can be a direct effect of driving on highways during poor weather?

Driving on highways during poor weather can lead to a higher chance of accidents due to several factors that directly impair driving conditions. Poor weather, such as rain, snow, fog, or ice, can significantly reduce visibility, affect road traction, and increase stopping distances. These conditions challenge even experienced drivers, making it more difficult to react to sudden changes in traffic or road conditions.

When visibility is low, drivers may not see obstacles or other vehicles in time to avoid a collision. The wet or icy surfaces can lead to vehicles skidding or losing control, especially at higher speeds typical on highways. Consequently, the likelihood of accidents increases as drivers may underestimate the effects of weather on their vehicle's handling.

The other options do not represent direct effects of poor weather on highway driving. Visibility of traffic signs typically decreases in such conditions rather than improving. Traffic congestion can become worse during inclement weather as vehicles slow down, rather than easing congestion. Lastly, vehicle performance generally suffers in poor weather conditions, as traction and steering can be adversely affected, making it challenging to maintain control of the vehicle.