Electric Traction | State the suitability of colour light signals & also state its three types.

Suitability of Colour Light Signals: 

1) Colour light signal displays the same aspect during day and night.

2) Colour light signal gives information of next signal in advance to the driver 

i.e. gives pre warning to control the speed of train.

3) No moving part, hence virtually maintenance-free.

4) Light weight structure, hence fast and easy installation.

5) Better visibility particularly during foggy weather.

6) Economical. 

7) Simplicity of indication to drivers.

8) Better ability to deal with traffic of varying speed.

9) Simpler and easier in operation.

10) Control on large signals at heavily worked stations.

11) Colour light signals have multiple units, depending upon the aspects to be conveyed.

Types Colour Light Signals: 

1) Two aspects of colour light signals. 

2) Three aspects of colour light signals. 

3) Four aspects of colour light signals.        

OR

1) Short range colour light signals.

2) Long range colour light signals.

3) Search light colour light signals.