6.1. EXAMPLE OF HOW WARNING TIME IS CALCULATED

• Reaction time – 5 seconds
• Time required to move the Workers, tools, equipment and materials
  clear of the Danger Zone – 20 seconds
• Minimum time to be in a Safe Place before Rail Traffic arrives – 10 seconds
• Minimum Warning time required Total – 35 seconds

TABLE 6.1: Example of How Warning Time is Calculated

WARNING
The Sighting Distance must be measured.

The minimum Sighting Distance needed to see an approaching Rail Traffic movement,
so that sufficient Warning can be given, is dependent on the minimum Warning time
required and the maximum Track speed, and is determined from Table 6.2 as
demonstrated in the following example:

Example: The minimum Warning time required in this example is 35 seconds and the
maximum Track speed in the area is 120 km/h, therefore the minimum Sighting
Distance of approaching Rail Traffic is calculated in Table 6.2 to be 1170 metres.
The Lookout must therefore be positioned to be able to see approaching Rail Traffic
from at least this far in order to give the minimum Warning time required. The
calculations must be rounded up to the nearest five (5) seconds.
The PO must:
 know the maximum speed for Rail Traffic on the Section of line that the work is to
take place; and
 conduct a test to determine how long it will take for the Workers to remove their
equipment and move to the Safe Place.