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Description

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.

Description

This joint ISO/CIE Standard, ISO 11664-3:2012(E)/CIE S 014-3/E:2011, is replacing CIE Standard CIE S 014-3/E:2011

Colour stimuli with different spectral distributions can look alike. An important function of colorimetry is to determine which stimuli look alike to a given observer with a given set of colour-matching functions. This is done by calculating a set of three tristimulus values for each stimulus. Equality of tristimulus values indicates equality of colour appearance under equal irradiation and viewing conditions.

This Standard is based on long-standing CIE recommendations (CIE15:2004 Colorimetry, 3rd edition) for the calculation of tristimulus values. It specifies methods of calculating the tristimulus values of colour stimuli for which the spectral distributions are provided. These colour stimuli may be produced by self-luminous light sources or by reflecting or transmitting objects.

The standard method is defined as summation at 1 nm intervals over the wavelength range from 360 nm to 830 nm. Alternative abridged methods are defined for larger intervals (up to 5 nm) and shorter ranges (down to 380 nm to 780 nm). The alternative methods are to be used only when appropriate and when the user has reviewed the impact on the final results.

The Standard may be used in conjunction with the CIE 1931 standard colorimetric observer or the CIE 1964 standard colorimetric observer.