Road rules

traffic lights

why do traffic lights have a tube over each light

knickknack54 Sat 07/06/08 09:11

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stuckin1968
Sat 07/06/08
10:09

I may be wrong but I believe it is to prevent strong sunlight obscuring the lights when they are lit.

Ethel
Sat 07/06/08
10:11

Two reasons, depending on the location.

As above, so the lights can be clearly seen even in very bright sunshine but also to stop the lights shining into nearby householders' bedroom windows.

sigma
Sat 07/06/08
11:26

And also to prevent the sun from making them appear illuminated.

sddsddean
Sat 07/06/08
16:01

...and sometimes they have really long hoods (the proper name for the 'tubes'), to stop drivers on other parts of the junction seeing the light and thinking it refers to them.

Panic Button
Tue 10/06/08
09:08

..and to stop tall people licking them, thinking they are sweeties.

madmondeo
Tue 10/06/08
19:57

lol panic

Compostella
Tue 17/06/08
09:12

And to stop people pre-empting the sequence change and getting a head start (which can be too early sometimes)

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