道路交通信号灯的国家和国际标准通常规定了灯的发光强度要求，以确保信号在足够的时间内可见，以便接近的驾驶员在低速道路上安全有效地响应信号。《CIE交通信号灯发光强度官方指南》（CIE 79-1988:道路交通信号灯设计指南）被广泛遵循，为标准制定提供了合理的方向。本指南基于CIE技术报告（CIE 48-1980:道路交通控制信号灯）中对该主题的全面审查。CIE在1989年至1994年期间对其建议进行了重大审查（见CIE 107-1994: 审查CIE对信号灯颜色和CIE DS004的官方建议。2-1996:光信号的颜色），本标准基于该审查。CIE（交通照明和信号）第4分部的技术委员会4-29（道路交通信号灯标准）负责审查和起草本标准。本标准涉及200mm道路交通信号灯的颜色、发光强度和发光强度分布。标准中包含了严重的太阳体模问题，它会影响对光线的正确识别。应注意的是，本标准仅考虑了CIE 79-1988中涉及的几个主题。这些主题的支持研究和实践经验足以支持标准化。 对于本标准中未涉及的主题，如有关高速道路和使用符号的交通灯的指南，建议用户遵循CIE 79-1988中提供的指南。本标准已获得CIE批准，并取代了CIE 79-1988中对200mm圆形信号的建议。它已被ISO批准为ISO/CIE联合标准。本标准可从CIE国家委员会或CIE中央局获得。还提供法文版和德文版（ISO 16508:1999/CIE S006.1/F-1998和CIE S006/G-1998）。

National and international standards for road traffic signal lights usually specify requirements for the luminous intensity of the lights to ensure that the signals will be visible in adequate time for an approaching driver to safely and efficiently respond to the signal on roads where speeds are low.The official guidance of the CIE for traffic signal luminous intensity (CIE 79-1988: A Guide for the Design of Road Traffic Lights) has been widely followed as providing sound direction for standard development. This guidance was based on a comprehensive review of the subject published as a CIE Technical Report (CIE 48-1980: Light Signals for Road Traffic Control).The CIE undertook a major review of its recommendations in the period 1989 to 1994 (see CIE 107-1994: Review of the official recommendations of the CIE for the colours of signal lights and CIE DS004.2-1996: Colours of light signals) and this Standard is based on that review. Technical Committee 4-29 (Standard on Road Traffic Lights) of Division 4 of the CIE (Lighting and Signalling for Transport) was responsible for the review and the drafting of this Standard. This Standard deals with the colour, luminous intensity and luminous intensity distribution for 200 mm road traffic signals. The serious problem of sun phantom, which can affect the correct recognition of the light, is included in the Standard.It should be noted that this Standard considers only a few of the topics covered in CIE 79-1988. These are the topics for which supporting research and practical experience were strong enough to support standardisation. For topics not covered in this Standard, such as guidance concerning higher speed roadways and traffic lights using symbols, the user is advised to follow the guidance provided in CIE 79-1988.This Standard has been approved by the CIE and replaces the recommendations made on 200 mm roundel signals in CIE 79-1988. It has been approved by ISO as a joint ISO/CIE standard.This Standard may be obtained from the CIE National Committees or the Central Bureau of the CIE. A French and a German version (ISO 16508:1999/CIE S006.1/F-1998 and CIE S006/G-1998) are also available.