참고문헌
- 交通安全施設實務便覽 警察廳
- Review of the official recommendations of the CIE for the colours of signal lights v.107 CIE
- Society of Automotive Engeneers Driver vision requirments E. Hartman
- Public Lighting J. B. de Boer(et al.)
- 交通工學 朴秉皓
- A Guide for the design of road traffic lights v.79 CIE