How can a slow driver create a traffic hazard?

A slow driver can create a traffic hazard primarily by increasing the chances of collisions from behind. When a vehicle is traveling significantly slower than the normal flow of traffic, it can disrupt the rhythm and pace of other drivers who are maintaining an appropriate speed. This disruption can lead to dangerous situations where drivers may not have enough time to react, potentially resulting in rear-end collisions.

In contrast, increasing fuel consumption relates to vehicle efficiency rather than a direct hazard to traffic flow. Blocking road signs could certainly cause issues with driver navigation, but it does not directly correlate with the actions of a slow-moving vehicle. Driving too fast in bad weather is unrelated to the issue of slow driving; it deals with risky behavior rather than inadequate speed. Therefore, the increased likelihood of accidents stemming from being significantly slower than the rest of traffic makes this the most relevant concern regarding hazards caused by slow drivers.