Analysis of the infrastructure works on accessibility using graph theory: case study “la Línea” tunnel

The importance of roads in the Colombian economy is undeniable, as they condition the transport of goods, this is why a method is proposed to quantify the impact of new projects, creating an additional tool for the decision makers. In this case was analyzed the impact of “la Línea” tunnel on the departments of Quindío and Tolima, calculating accessibility indexes in two states, before and after the construction of the tunnel, this analysis was complemented with the calculation of indirect costs based on operational and costs per user time. The analysis showed that the construction of the tunnel represented an improvement of the accessibility on Quindío by 5,13% and null on Tolima due to the project’s unidirectional nature, nevertheless it was obtained $932.913.194 COP (≈USD 229.141 for 2024) in daily savings.