Which factor does NOT directly dictate asphalt layer thickness?

The factor that does not directly dictate asphalt layer thickness is related to project funding availability. While funding can influence decisions made in a construction project, such as the overall scope or the materials used, it does not determine the technical specifications for the asphalt layer thickness itself.

On the other hand, the plans developed by the designer are crucial as they provide the specified thickness based on the project's design requirements. Traffic load expectations are critical as they inform the necessary thickness to support the anticipated load and ensure the pavement's longevity and structural integrity. Environmental conditions, such as temperature and moisture levels, also play a significant role in determining how thick the asphalt layer needs to be, as these factors can affect the performance and durability of the pavement. Thus, while funding is an important consideration for project management, it does not directly dictate the specifications for asphalt layer thickness.