(a) Minimum Requirements Minimum height 1 metre (3 ft for fences built before 1980). Optional for motorcycle and sidecar tracks a wooden safety fence shall have a minimum thickness of 76 mm with vertical posts spaced not more than 2.5 metres centre to centre, suitable for the protection of the public. A skid rail must be firmly affixed to the structure of the fence at approximately hub height of competing vehicles. A 300mm x 50mm skid board is not required for a concrete safety fence, a smooth paneled or horizontal timbered fence, provided that the horizontal timbers are minimum 300mm x 76 mm and these are built to the satisfaction of the inspecting steward. All other sections must have a wall made of smooth concrete or of an approved design. A further safety structure is required above or behind the concrete wall consisting of the placement of 32kg minimum railway irons, placed at not more than 5 metres apart and extending vertically not less than 2133mm above the track surface level. These must be built to the satisfaction of the inspecting steward. Two 25mm diameter wire ropes completely around the circuit to be fixed to the iron posts in an approved manner, (i.e. may be threaded through or clamped), the bottom wire to be approximately 550mm above the existing fence. These wires to be approximately 550mm apart. Tracks with gates must have a 25mm diameter wire rope firmly fixed at each gate entrance, 550mm above the gate, whilst practices or races are in progress. (b) Alternative to Railway Irons The following are approved alternatives to Railway Irons, with the applicable maximum spacing between the relevant material:SECTION MAXIMUM SPACING 150 UB 14 4 metre 150 UB 18 5 metre 180 UB 18 5 metre 150 UC 23 5 metre 150 x 75 x 6 RHS 4 metre 150 x 100 x 5 RHS 4 metre 150 x 100 x 6 RHS 5 metre 100 x 100 x 9 RHS 4 metre 125 x 125 x 5 RHS 4 metre 125 x 125 x 6 RHS 5 metre 80 NB Ned Galv. or Black 1.2 metre 100 NB Med Galv. or Black 1.9 metre 125 NB Med Galv. or Black 3 metre 150 NB Med Galv. or Black 4.5 metre (c) Safety Netting To stop tyres, wheels, etc. flying up into the spectators areas, deer or sheep netting or similar, must be attached to the fence posts with the top edge of the netting being at least 3m above the track surface level and the lower edge of the netting being no more than 1.20m from the track surface level, (excepting where an existing wooden or similar fence is over 1m high, when the lower edge of the netting must be no more than 300mm above the top of the safety fence) and the top edge of the netting must extend up to at least 3m above the track surface level.
2010 ELECTRONIC RULEBOOK