What might be indicated by thicker lines in a blueprint?

Thicker lines in a blueprint are commonly used to represent load-bearing walls. This representation is critical as it indicates the structural integrity of a building and highlights the elements that support the overall framework. Load-bearing walls play a crucial role in distributing weight, which is vital for ensuring stability and safety in the design of a structure. By differentiating these significant walls from non-structural elements or other systems, such as electrical paths or HVAC installations, architects and builders can clearly communicate which parts of the design are essential for supporting loads, thus preventing structural issues during construction.