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Four aspect
A colour light using four lights. From top to bottom the lights are yellow, green, yellow, and red. A red indication means that the next section contains a train. A single yellow indication (using the lower yellow) means that the next section is clear but there is a train in the following one. A double yellow indication means that the next two sections are clear but there is a train in the one beyond that. A green indicates that the next three sections are clear. Depending on the speed of the train, it will need to commence slowing on either a single or double yellow.
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