What is the main purpose of road signs near highways?

The main purpose of road signs near highways is to provide essential information about travel conditions. These signs serve critical functions, informing drivers about speed limits, upcoming exits, road conditions, distances to destinations, and warnings about potential hazards, such as construction zones or dangerous weather conditions. Such information is vital for maintaining safety and facilitating efficient travel, ensuring that drivers can make informed decisions on the road.

The other options, while they may touch on certain aspects of road signage, do not encapsulate the primary role these signs play in enhancing safety and providing necessary travel information. Aesthetic enhancement, intimidation, and advertising do not align with the primary focus of road signs, which is to support safe and informed driving.