PURPOSES: This study aimed to evaluate the appropriateness of safety with the standard for threshold zone luminance as specified in the Recommendation for Lighting of Traffic Tunnel, which has been widely adopted worldwide.
METHODS: A driving test of the subject in a full-scale road tunnel was conducted. The adaptation luminance and threshold zone luminance, which should be known for the driver to perceive an object within stopping sight distance, were obtained. These values were compared with the adaptation luminance and threshold zone luminance obtained by the existing reduced model test and tunnel lighting standard that has served as a guideline for the current threshold zone luminance standard.
RESULTS : According to this study, threshold zone luminance should be increased to at least 1.8 times the value proposed in the existing studies and to twice the domestic tunnel lighting standard (KS C 3703: 2014).
CONCLUSIONS : The threshold zone luminance proposed in this study differs largely from that obtained from indoor tests and from the current tunnel lighting standard used worldwide; this difference may be attributed to the fact that the indoor tests did not incorporate driving workload, non-uniformity of luminance distribution in terms of sight, and factors that reduce the visibility of the driver, such as the light reflected into the driver’s eyes. Hence, it is necessary to further review the factors that reduce the visibility of drivers approaching tunnels in order to determine the rational tunnel threshold zone luminance.

1. 서론
2. 문헌고찰
3. 실규모 터널 주행실험
4. 결론 및 향후 연구
감사의 글
REFERENCES

• 정준화(정회원·한국건설기술연구원 도로연구소 선임연구위원·과학기술연합대학원대학교 교통물류 및 ITS공학과 교수) | Jeong, Jun Hwa
• 조원범(정회원·한국건설기술연구원 도로연구소 수석연구원·서울시립대학교 교통공학과 박사과정수료) | Cho, Won Bum 교신저자
• 박원일(정회원·과학기술연합대학원대학교 교통물류 및 ITS공학 석사과정 & 한국건설기술연구원 도로연구소 학생연구생) | Park, Won Il