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How many feet above the landing's surface must the side rails of a portable ladder extend when accessing an upper landing surface?

  1. Two

  2. Three

  3. Four

  4. Five

The correct answer is: Three

The side rails of a portable ladder must extend a minimum of three feet above the upper landing surface when accessing it. This requirement ensures that the user has adequate handhold and stability when transitioning on and off the ladder. The three-foot extension allows for easier gripping, which enhances safety by reducing the risk of slipping or losing balance as the individual steps onto or off the ladder. Maintaining this height is a crucial safety measure to prevent accidents that can occur during ladder use, particularly when working at elevated heights.