When are directional signs on primary routes typically placed?

Directional signs on primary routes are typically placed on approaches and at junctions to ensure that drivers have clear guidance on the route they should take. These signs are essential for navigation, particularly in areas where multiple roads intersect or where decisions about route changes must be made. By positioning these signs strategically, transportation authorities help reduce confusion and enhance safety, enabling drivers to make informed decisions well in advance of junctions or turns.

The placement of directional signs on approaches gives drivers ample warning to prepare for upcoming intersections, allowing them to adjust their speed and position safely. Additionally, at junctions, these signs are crucial for indicating the correct path to desired destinations, whether it be nearby cities, highways, or significant points of interest.

In contrast, options such as placement only at toll booths, during road construction zones, or exclusively in urban areas do not encompass the broader necessity of directional signage for both rural and urban primary routes. Directional signs are vital for all types of roadways to enhance navigation and safety, regardless of the specific conditions or locations mentioned in those options.