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This recommended practice covers the criteria for steps, ladders, walkways, platforms, grab rails (handrails), grab irons, guardrails, and entrance openings as they relate to aiding the operator and/or servicemen in performing their functions on the vehicle.

This SAE Recommended Practice defines the worldwide human physical dimensions to be used in construction, general purpose industrial, agricultural tractors, forestry and specialized mining machinery categories as defined in SAE J1116 JUN86.