Minimum Railway/Road Crossing Sightline Requirements For All Grade Crossings Without Automatic Warning Devices G4-A

Diagram for Minimum Railway/Road Crossing Sightline Requirements For All Grade Crossings Without Automatic Warning Devices
Road (H value)
Maximum Speed (km/h) for vehicle Distance* (H on above graph)
Desirable (metres) Minimum (metres)
Stop 8 --
20 20 15
30 30 20
40 45 35
50 65 50
60 85 70
70 110 90
80 140 120
90 170 145
100 200 175

Rail (T value)
Maximum Train Speed (m/h) Minimum* Distance <>
feet (metres)
Stop 100 (30)
20 300 (91)
30 450 (136)
40 600 (182)
50 750 (227)
60 900 (273)
70 1050 (318)
80 1200 (364)
90 1350 (409)
100 1500 (455)

* To be increased as required by Notes 3 and 4 below.

To Establish Required Clear View Area

  1. Use maximum allowable train and vehicle speeds.
  2. View between 1.1 m above road (eye level) to track level.
  3. Where gradients within 8 m of rail exceed 5% or heavy or long vehicles regularly cross, clear view from a vehicle stopped at the crossing must also extend a minimum of 50% beyond "T", and more if necessary, so stopped vehicles have sufficient time to start up and cross safely.
  4. Where heavy vehicles operate on long descending approaches, increase "H" to 'stopping sight distances'.
  5. If clear view cannot be achieved for existing speeds, reduce speed of vehicles or trains until such time as an automatic warning system can be installed.
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