What does a "Road Work Ahead" sign advise?

Answer: B — Drivers should expect reduced speed limits.

A "Road Work Ahead" sign specifically indicates that there are construction or maintenance activities occurring on or near the roadway, which typically necessitates drivers to be cautious and prepared to adjust their driving behavior. This often involves expecting reduced speed limits in the work zone to ensure safety for both drivers and workers. Lower speed limits help to reduce the likelihood of accidents by providing drivers with more time to react to potential hazards, such as equipment, workers, or changes in road conditions. In contrast, other options suggest scenarios that are either unrelated to road work or do not accurately describe the implications of the sign. For instance, mentioning potholes addresses a different issue that does not necessarily correlate with road work. Indicating that road conditions are normal would be misleading since the presence of a "Road Work Ahead" sign signifies that there are likely temporary changes to the usual driving conditions. Finally, suggesting rerouting may imply an immediate need to change routes, which is not always the case simply because road work is underway; it often allows for continued travel, albeit with caution and possibly at a reduced speed.