PSI - Issue 84

E. Renzi et al. / Procedia Structural Integrity 84 (2026) 1361–1368 E. Renzi et al. / Structural Integrity Procedia 00 (2026) 000–000

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Table 1. Introduction of the alternative for the minimum frequency of periodic ordinary inspections to the table 7.1 of the Bridge Guidelines for type 1-structures (the bridges subjected to the surveillance system introduced by the bridge guidelines are classified as type 1) Low Medium-low Medium Medium-High High Table 7.1 Bridge Guidelines (type 1) Two-year 18 months One-year Depending on monitoring or every six months Depending on monitoring or every six months New OI 2025

Two-year (no modification)

18 months (no modification)

One-year (no modification)

Depending on monitoring or every six months or one year + 3-months intermediate inspection

Depending on monitoring or every six months or one year + 3-months intermediate inspection

Conclusions The Italian Bridge Guidelines introduced a structured, multi-level approach that, starting from the inventory, addresses aspects related to safety checks and inspections, defectiveness, and criteria for the multi-level assessment of risk for road structures, representing an important technical reference for sector operators, unique in its kind. The Operational Instructions, whose first version dates back to 2022, provide road managers with clarifications and practical guidance, and their updates are aimed at the continuous improvement of the processes for managing the safety of existing bridges. The update adopted by the Higher Council of Public Works in 2025 provides further elements of clarity and uniformity for the application of the Guidelines, standardizing the approach and facilitating control and certification activities by the managers. Acknowledgements The authors acknowledge the support of FABRE – “Research consortium for the evaluation and monitoring of bridges, viaducts and other structures” (www.consorziofabre.it/en) and ANSFISA – “National Agency for the Safety of Railways and of Road and Motorway Infrastructures”. Any opinion expressed in the paper does not necessarily reflect the view of the funder. References CSLLPP, 2025. Decree No. 413 of 5 November 2025 of the President of the Higher Council of Public Works (Consiglio Superiore dei Lavori Pubblici – CSLLPP) by which the updated text of the "Operational Instructions for the application of the Guidelines for the classification and management of risk, the assessment of safety and the monitoring of existing bridges" together with the relevant annexes, was adopted. MIMS, 2022. Decree no. 204 of 1 July 2025 of the Italian Ministry of Infrastructure and Sustainable Mobility (Ministero delle Infrastrutture e della Mobilità Sostenibili – MIMS) by which the text of the "Guidelines for the classification and management of risk, the assessment of safety and the monitoring of existing bridges" as per Annex A, was adopted. MIT, 2018. Decree of 17 January 2018 of the Italian Ministry of Infrastructure and Transport: Update of the "Technical Standards for Constructions". Perilli, N., Lombardi, M., Nenci, N., Squeglia, N., & Stacul, S. , 2024. Definition of direct and indirect types of landslide-bridge interference and a checklist for identifying and characterizing potential landslides. Procedia Structural Integrity , 62, 546-552. https://doi.org/10.1016/j.prostr.2024.09.077 Salvatore W., Uva G., Venanzi I., Mazzotti C., Morici M., Natali A., Dall’Asta A., Ubertini F., Mannella P., Lepori L., Pellicanò F., Calò M., Cardillo E., Nettis A., … 2024. Application of Italian Guidelines for structural-foundational and seismic risk classification of bridges: The Fabre experience on a large bridge inventory. Procedia Structural Integrity 62:1–8. https://doi.org/10.1016/j.prostr.2024.09.009 Salvatore W., Uva G., Venanzi I., Mazzotti C., Morici M., Natali A., Dall’Asta A., Ubertini F., Mannella P., Lepori L., Pellicanò F., Calò M., Cardillo E., Nettis A., … 2026. Structural and Seismic Risk Classification of Bridges According to the Italian Guidelines: A Critical Perspective from the Jointed Experience of FABRE and Anas. IJBER 3:1. https://doi.org/10.70465/ber.v3i1.72 ANSFISA, 2022. Istruzioni Operative per l’applicazione delle Linee Guida per la Classificazione e Gestione del Rischio, la Valutazione della Sicurezza ed il Monitoraggio dei Ponti Esistenti .