KOREASCHOLAR

Ensuring sufficient road surface friction is essential for maintaining traffic safety, particularly under adverse weather conditions. However, the current Korean design standards for the longitudinal friction coefficient (LFC) are primarily derived from foreign guidelines with limited empirical validation under domestic road and climatic conditions. This study aims to generate field-based LFC data across a range of road surface types and vehicle speeds and evaluate the appropriateness of the LFC values currently adopted in national road design standards. The field experiments were conducted at the Yeoncheon SOC Proving Ground. The five representative road surface conditions were dry, wet, slush, compacted snow, and icy. Driving tests were conducted for each surface condition at four speeds (30, 40, 50, and 60 km/h) using a test vehicle equipped with continuous friction measuring equipment. Twenty scenarios were tested with multiple repetitions to ensure statistical reliability. Consequently, the average LFC values were 0.748 for dry, 0.615 for wet, 0.232 for slush, 0.173 for compacted snow, and 0.133 for icy conditions. The results showed that road surface conditions had a significantly greater impact on the LFC than vehicle speed. Moreover, the values measured under low-friction conditions were consistently lower than those specified in the current Korean standards. These findings highlight the need to revise the existing LFC design values to better reflect domestic winter road environments. The data can also inform the development of road safety strategies such as variable speed limit systems, autonomous vehicle control algorithms, and automatic emergency braking systems suitable for winter operations.

ABSTRACT
1. 서론
    1.1. 연구의 배경 및 목적
    1.2. 연구의 방법 및 범위
2. 기존문헌고찰
    2.1. 노면상태와 교통사고 간의 관계
    2.2. 종방향 미끄럼 마찰계수의 측정 및 활용
    2.3. 시사점
3. 분석방법론
    3.1. 실험 시나리오 설정
    3.2. 실험 환경 조성
    3.3. 노면 조건별 마찰계수 측정
4. 분석 결과
    4.1. 노면조건별 마찰계수 프로파일 특성 분석
    4.2. 주행속도에 따른 마찰계수 통계 분석
    4.3. 노면조건에 따른 마찰계수 통계 분석
5. 결론 및 향후 연구
REFERENCES

• 조영(한국건설기술연구원 수석연구원) | Jo Young
• 박기수(과학기술연합대학원대학교 박사과정) | Park Kisoo
• 김기수(한국건설기술연구원 연구위원) | Kim Kisu
• 김용석(한국건설기술연구원 연구위원) | Kim Yongseok
• 이석기(한국건설기술연구원 연구위원) | Lee Sukki Corresponding author