Development of a Cooperative Intelligent Speed Adaptation Strategy for Adverse Weather Conditions

Young Jo; Yongseok Kim

doi:10.7470/jkst.2026.44.5.988

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2026 Vol.44, Issue 5 Preview Page

Article

Development of a Cooperative Intelligent Speed Adaptation Strategy for Adverse Weather Conditions 악천후 환경 대응을 위한 협력 지능형 속도조정 서비스 전략 개발 연구

31 October 2026. pp. 988-1006

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Abstract

An active speed management strategy that reflects real-time road surface and traffic conditions is required to prevent traffic crashes under adverse weather conditions. In mixed traffic environments with automated and conventional vehicles, cooperative traffic safety management can support safe driving by sharing road surface, weather, and traffic information collected from roadway infrastructure. The purpose of this study is to develop a cooperative- intelligent speed adaptation (C-ISA) strategy that determines and provides recommended speeds based on road surface and traffic conditions. C-ISA is a dynamic speed management service that determines appropriate speeds using road-surface friction coefficients and traffic flow levels and provides stepwise speed information to vehicles and drivers. The proposed strategy was evaluated through a field-driving experiment under wet and rainy conditions. Six scenarios were designed with final recommended speeds of 60, 50, and 40km/h on a road with a posted speed limit of 80km/h. Eleven participants drove each scenario three times, and driver compliance was evaluated based on the ratio of actual speed reduction to required speed reduction. The mean compliance rates at the first and second deceleration stages were 90.92% and 98.56% under wet conditions and 90.08% and 97.25% under rainy conditions, respectively. The results showed that higher compliance was achieved at the final speed provision stage under both conditions. The proposed C-ISA is expected to support gradual deceleration and contribute to cooperative speed management under adverse weather conditions.

Keywords

adverse weather

cooperative-intelligent speed adaptation (C-ISA)

driver compliance rate

friction coefficient

recommended speed

악천후 환경에서의 교통사고 예방을 위해서는 실시간 노면 및 교통상태를 반영한 능동적인 속도관리전략이 요구된다. 특히 자율주행차와 일반차가 혼재하는 교통환경에서는 도로 인프라에서 수집한 노면･기상･교통정보를 차량과 공유하고, 해당 도로환경에 적합한 속도정보를 제공하는 협력형 교통안전관리체계가 필요하다. 따라서 본 연구의 목적은 노면상태와 교통상태를 종합적으로 고려하여 권장속도를 산정하고 단계적으로 제공하는 협력 지능형 속도조정 시스템(cooperative-intelligent speed adaptation, C-ISA)의 서비스 전략을 개발하는 것이다. C-ISA는 노면상태에 따른 미끄럼 마찰계수와 교통류 수준을 기반으로 도로환경에 적합한 권장속도를 산정하고, 이를 차량과 운전자에게 실시간으로 제공하는 동적 속도관리 서비스이다. 제안한 정보제공 전략의 적용 가능성을 검토하기 위해 습윤 및 강우 조건을 대상으로 제한속도 80km/h인 도로에서 최종 권장속도를 60, 50 및 40km/h로 설정한 총 6개의 실주행 시나리오를 구성하였다. 피실험자 11명을 대상으로 각 시나리오를 3회 반복주행하였으며, 요구 감속량 대비 실제 감속량을 순응률로 정의하여 단계별 운전자 반응을 분석하였다. 분석 결과, 습윤 조건의 평균 순응률은 첫 번째와 두 번째 감속단계에서 각각 90.92%와 98.56%로 나타났으며, 강우 조건에서는 각각 90.08%와 97.25%로 분석되었다. 두 노면조건 모두 최종 권장속도가 제공되는 두 번째 단계에서 상대적으로 높은 순응률을 보여, 단계적 권장속도 제공전략이 운전자의 점진적인 감속을 유도하는 데 활용될 수 있음을 확인하였다. 본 연구에서 제안한 C-ISA는 실시간 도로환경 변화에 대응하여 자율주행차와 일반차의 안전한 속도선택을 지원하는 인프라 협력형 속도관리전략 수립에 기여할 것으로 기대된다.

키워드

악천후

협력 지능형 속도조정

운전자 순응률

미끄럼 마찰계수

권장속도

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Information

Publisher :Korean Society of Transportation
Publisher(Ko) :대한교통학회
Journal Title :Journal of Korean Society of Transportation
Journal Title(Ko) :대한교통학회지
Volume : 44
No :5
Pages :988-1006
Received Date : 2026-08-25
Revised Date : 2026-09-03
Accepted Date : 2026-09-29
DOI :https://doi.org/10.7470/jkst.2026.44.5.988

Journal of Korean Society of Transportation ISSN:1229-1366(Print) 2234-4217(Online) 대한교통학회지

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