Fig 7

When designing signal plans symbols used are as listed below:

When showing a signal normally circles are drawn depicting each aspect indicated by a signal. If a signal has two aspects two circles are shown, if it has three aspects then three circles are drawn. In side the circle lines drawn indicate the color of the aspect. A vertical line indicates red aspect, horizontal line indicates a green aspect while a line at 45 deg usually drawn left to right indicates a yellow aspect. All signals display an apsect normally. For all stop signals this is red. The aspect which is normally displayed by a signal is indicated by drawing the line twice within the circle.

Using these symbols a typical signalling plan will look as below