Digital Integration for Sustainable Motorway Delivery: A Case Study of the Sibiu–Făgăraș Motorway, Romania

Infrastructure projects of significant scale face persistent challenges in data coordination, scheduling, and cost control. Although individual digital tools are widely adopted in the construction sector, empirical evidence on their coherent systemic integration within a unified management cycle remains limited. This explanatory case study addresses that gap by examining Section 3 of the Sibiu–Făgăraș Motorway (17.61 km, 27 structures) in Romania—an ongoing TEN-T project. Evidence was collected during the active construction phase (January 2022–December 2024) from Common Data Environment (CDE) logs, BIM/BrIM model outputs, drone photogrammetry datasets, schedule and payment records, and Business Intelligence (BI) dashboards. The study demonstrates how six digital applications—CDE, model-based fabrication (LOD 400), 3D coordination, 4D/5D simulation, reality capture, and BI dashboards—were operationalized as a closed-loop Plan–Do–Check–Act (PDCA) cycle, functioning as a human-in-the-loop digital twin for project delivery. Illustrative operational indicators observed during implementation include an estimated 20% reduction in coordination-related RFIs, a 15% reduction in steel fabrication material waste, a reduction in payment validation cycle time from 15 days to approximately 2 days, and a 40% improvement in cash flow stability through data-driven activity re-sequencing. These findings suggest that systemic digital integration, rather than isolated tool adoption, supports more proactive and sustainability-aligned infrastructure project control.