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The main principle of the traffic lights is to reach the light output from the light source to the drivers and pedestrians with maximum efficiency; The false lights such as the sunlight on the top are also reflecting the light outside the distribution zone. Signal lights are designed according to these effects.
Phantom signal means "ghost sign" as word meaning. Traffic lights, working in sunlight; The sun's rays produce a misleading effect on the signal lamp. The less the phantom signal is produced, the more successful the traffic light is. The misleading signal class is measured by the Is / Iph ratio. Is, the light expresses the light intensity emitted from the light source within the signal lamp; Iph is the light intensity that is generated by the reflection of the falling sunlight on the signal lamp. The more the source light from the inside can suppress the reflection of sunlight, the better the performance. If the Is / Iph ratio is greater than 16, the misleading signal is grade 5 and this is the best value. General Directorate of Highways in Turkey wants to be at least 3 in the specification of this value.
Alternatively, to reduce the phantom signal effect, it is also a method of manufacturing the front lens of the transducer as Gray-Transparent. When the sunlight falls on the gray windshield, it cannot create a signal colored misleading light, but the gray lenses-glasses reduce the welding light intensity (Is) by absorbing it. This kind of gray-transparent signal lamps are recommended in areas that operate under very dense sunlight. In areas exposed to lower sunlight, colored lens signaling is recommended.