The following is a brief introduction to the common problems and causes of traffic lights:
1, traffic lights can not be used normally.
Analysis: The traffic signal lamp hardware defect or failure, can not be displayed properly, resulting in the signal light is not lit, a single light color display time is too long, the signal light brightness is not enough and other issues.
2. Traffic lights use "composite lights."
Analysis: "composite lamp" refers to the display of red, yellow and green lights in the same light unit. According to the standard requirements, "the three geometric positions of red, yellow, and green are separated." Traffic participants such as color-blind, color-weak, etc. cannot identify the light color of the signal light through the location, and there are potential security risks.
3. The order of traffic lights is not standardized.
Analysis: traffic lights red, yellow, and green should be arranged from top to bottom, from left to right.
4. Traffic lights should not be set.
Analysis: Signals have not been set at intersections or road sections that have reached the set conditions. The traffic at the intersections is poor, which easily leads to traffic jams and even causes traffic accidents.
5, the number of traffic lights installed too little analysis:. Only one set of signals (main lights) is set for each entrance direction of a two-lane roadway and a large intersection in two directions in a road section, which cannot meet the coverage requirements of the signal lights and affect the driver's accurate identification.
6. The location and orientation of the traffic lights are not correct.
Analysis: The position of the signal light is not set according to the standard, it does not meet the driver's visual recognition habits and is not conducive to the driver's rapid identification and response.
7, traffic lights installed too far.
Analysis: The position of the signal lamp is set at a distance of more than 80 meters from the stop line indicated in the direction. When the fog or light is strong, it affects the driver's accurate identification and there is a hidden traffic hazard.
8, traffic lights are blocked.
Analysis: The signal lights on some roads, especially the pillar-type signal lights, are blocked by trees, billboards, and promotional banners, affecting drivers' visibility and hidden traffic risks.
9. The function of traffic lights and intersection lanes does not match.
Analysis: There is a left turn or right turn signal lamp and a dedicated left turn or right turn phase at intersections where there is no dedicated left-turn lane or dedicated right-turn lane. The signal light does not match the function of the intersection lane.
10. Directional signal lights release phase traffic rights conflict.
Analysis: Some intersection direction indicator lights and motor vehicle signal lights (full-screen lights) with green light, or left, right, and right directions indicate the green light with three lights, there is a signal light indicating vehicle traffic flow with the same non-motor vehicle There is a problem of security risks and law enforcement responsibilities in the issue of pedestrian traffic and pedestrian traffic conflicts.
11. The sequence of traffic light color conversion is not standardized.
Analysis: red-green-yellow-red, in which the yellow light duration should be 3 to 5 seconds.
12. The signal timing of traffic lights is not reasonable.
Analysis: The signal timing does not take into account the real-time changes in traffic flow. The timing plan for each day is fixed or only one or two scenarios.
13. There is not enough time for pedestrian crossing signals.
Analysis: The pedestrian green time is not enough, or no traffic engineering measures have been taken to reduce the pedestrian crossing distance. As a result, pedestrians cannot safely pass through the intersection during the green light and there are potential security risks.
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