In this paper, we have explained some of the possible ways of determining influence lines for statically determined plane trusses. Influence line is a graphical representation of the influence function used for the purpose of calculating moving loads on structures, assuming a low speed of movement of the acting load. Influence lines can be determined for everything that can be expressed as a function of the position of the unit force and are an excellent tool for understanding how forces are transmitted onto beams. In this paper, the influence lines of rod elements of a lattice system were determined and we focused on longitudinal forces as the only required parameters of lattice systems. It is assumed that the load is applied exclusively in the joints of the lattice systems in order to avoid the occurrence of bending in the elements. In the processed examples, we highlighted the way in which rods positioned differently in truss planes work depending on the position of the load. Starting with the application of sections in the construction of influence lines for lattice systems, the procedure for determining the influence lines for the internal forces of bars of a planar statically determined lattice is highlighted. With this static procedure, we saw a difference in the shape of the diagram depending on the role of the rod in the given system. The expressions required for the construction of influence lines were obtained from the equilibrium equations that we also used in the second discussed method, the application of joints in the construction of influence lines. With this procedure, we more simply came up with the appearance of influence lines of the vertical filling rods and saw the limits within which said rods take the load. The last prominent method was the application of kinematics. To use this method, knowledge of virtual work is required. The kinematic method for certain rod elements within the lattice system is a faster and a more transparent way of determining influence lines. The methods presented in this paper are only some of the possible ways of solving influence lines and their application is not limited exclusively to plane trusses nor to statically determined systems.