A Yellow Vinyl Strap Indicating The Zero Line For World Athletics Pole Vault Events. World Athletics Rule: "10Mm Wide And Of Distinguishable Colour, Shall Be Drawn At Right Angles To The Axis Of The Runway, In Line With The Back End Of The Box (Zero Line). A Similar Line Shall Appear On The Surface Of The Landing Area And Be Prolonged As Far As The Outside Edge Of The Uprights.
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