In CIE115, motor vehicle road is divided into five class M1 ~ M5, with an average luminance, luminance uniformity, luminance longitudinal uniformity, environment than and evaluate glare of incremental threshold value to evaluate the quality of road lighting, the evaluation contents and index are shown in table 1. In America,
in CIE115, motor vehicle road is divided into two categories, the M1 to M5. Glare evaluation of the average brightness, total brightness uniformity, longitudinal brightness uniformity ratio and threshold value increment, environment is used to evaluate the quality of road lighting. The evaluation contents and index are shown in table 1. Road lighting design standards in the United States, according to the complexity of road and traffic flow is divided into six types. For each type of roads, according to the different reflective material and traffic flow, set up different high, medium and low-grade evaluation index. IESNA puts forward three kinds of evaluation index of road lighting. Designer can according to their own needs to choose the appropriate index to carry on the design. These three indicators are illuminance index ( Including the average intensity of illumination and the intensity of illumination uniformity) , brightness index ( Including the average brightness uniformity, brightness and brightness longitudinal uniformity) And the small target visibility index. Intensity of illumination and brightness index contains evaluation glare screen brightness than the index. According to the CIE and IESNA the content of the two kinds of road lighting design standards, can draw two types of motor vehicle lanes lighting design standard differences mainly reflects in the following three points: 1. The choice of evaluation index. Brightness index is mainly used for evaluation, including threshold value increment ratio index and environmental index. IESNA using three indicators to evaluate glare, namely, intensity of illumination, brightness index and index of the small target visibility STV, illuminance and brightness index are including screen brightness than the index. 2. The calculation method of evaluation index. The main difference between brightness index calculation. CIE stipulated in each lane is only an observer, and its fixed in the computing area starting position after 60 metres, to observe the brightness of the light cycle all matrix ( As shown in figure 1) 。 IESNA rules, however, calculate each line of the regional point of matrix with an observer, and each observer always observe matrix point the brightness of the 83 m in front of the line direction matrix ( As shown in figure 2) , which means that the observer IESNA standard not only lateral movement on the perpendicular to the direction of the lane, and longitudinal movement in parallel to the direction of the lane.