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However, some edge devices in the RSU telecommunication network with limited computing power, due to their simple structures, struggle to implement complex security measures, making them vulnerable nodes in RSU networks and prime targets for cyberattacks. Hence, technologies such as intrusion detection are essential for providing security. However, designing an intrusion detection method that is both efficient and lightweight enough for deployment on RSU devices remains an urgent challenge. To settle these issues, this paper proposes a novel intrusion detection rule generation method that optimise LLM\u2010Generated Intrusion Detection Rules with support vector machine (SVM). This approach automates the generation of intrusion detection rules for new attack types and employs SVM to optimise the parameter values within these rules, making the LLM\u2010generated rules more accurate. The generated detection rules are designed to achieve effective intrusion detection on most edge devices, providing a robust solution for enhancing the security of the RSU network. After the verification of the real machine experiment, the proposed IDS has a detection accuracy of 98.89% for the processed attack types.<\/jats:p>","DOI":"10.1111\/exsy.70268","type":"journal-article","created":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T06:55:05Z","timestamp":1777272905000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["<scp>LLM<\/scp>\n                    \u2010Driven Sustainable Cybersecurity for Future Intelligent Transportation System:\n                    <scp>RAG<\/scp>\n                    \u2010Based Rule Generation and Edge\u2010Optimisation for Roadside Infrastructure"],"prefix":"10.1111","volume":"43","author":[{"given":"Jian","family":"Li","sequence":"first","affiliation":[{"name":"Information Technology Research Center of Shandong High\u2010Speed Innovation Research Institute  Jinan China"},{"name":"State Key Laboratory of Intelligent Transportation System  Jinan China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-0991-4506","authenticated-orcid":false,"given":"Guanjie","family":"He","sequence":"additional","affiliation":[{"name":"School of Transportation Science and Engineering, Beihang University  Beijing China"},{"name":"State Key Laboratory of Intelligent Transportation System  Beijing China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wen","family":"Rong","sequence":"additional","affiliation":[{"name":"Information Technology Research Center of Shandong High\u2010Speed Innovation Research Institute  Jinan China"},{"name":"State Key Laboratory of Intelligent Transportation System  Jinan China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xinpeng","family":"Yao","sequence":"additional","affiliation":[{"name":"Information Technology Research Center of Shandong High\u2010Speed Innovation Research Institute  Jinan China"},{"name":"State Key Laboratory of Intelligent Transportation System  Jinan China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zijian","family":"Wang","sequence":"additional","affiliation":[{"name":"Information Technology Research Center of Shandong High\u2010Speed Innovation Research Institute  Jinan China"},{"name":"State Key Laboratory of Intelligent Transportation System  Jinan China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1704-7211","authenticated-orcid":false,"given":"Mohammed","family":"Amoon","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering College of Applied Studies, King Saud University  Riyadh Saudi\u00a0Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4929-5383","authenticated-orcid":false,"given":"Saru","family":"Kumari","sequence":"additional","affiliation":[{"name":"Department of Mathematics Chaudhary Charan Singh University  Meerut India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6502-472X","authenticated-orcid":false,"given":"Chien\u2010Ming","family":"Chen","sequence":"additional","affiliation":[{"name":"Nanjing University of Information Science and Technology  Nanjing China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2026,4,26]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/ICCEBS58601.2023.10449209"},{"key":"e_1_2_10_3_1","first-page":"1","volume-title":"2025 International Conference on Quantum Photonics, Artificial Intelligence, and Networking (QPAIN)","author":"Ahmed K. 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