What is the main purpose of advance warning signs in a work zone?

The main purpose of advance warning signs in a work zone is to inform drivers about upcoming work zones. These signs are critical in alerting motorists to potential hazards, changes in road conditions, or reductions in lane capacity that lie ahead. By providing this advance notice, drivers can prepare for necessary actions, such as slowing down, merging into a different lane, or exercising additional caution. This proactive communication is essential for maintaining safety for both road users and workers in the construction area.

While advanced warning signs are not intended to increase vehicle speed, serve as decoration, or provide directions, their role in traffic management is central to preventing accidents and ensuring smooth traffic flow through and around work zones. This emphasis on safety highlights why the correct answer emphasizes informing drivers effectively.