Which of the following represents a 3 ft by 3 ft crosstie?

• A. 2 ft x 2 ft crosstie
• B. 3 ft x 3 ft crosstie
• C. Triangle crosstie
• D. Modified crosstie

Answer: (B)

Understanding how cribbing pieces are described by their footprint helps here. A crosstie described as 3 ft by 3 ft is a square block with a 3-foot length and a 3-foot width, giving a uniform base to spread load and resist tipping during stabilization. This exact 3x3 footprint is what the question specifies, so it’s the best representation of that size. A 2 ft by 2 ft block would not meet the 3x3 dimension, a triangular shape wouldn’t provide a rectangular contact area needed for stable support, and a modified crosstie implies a different configuration that isn’t the standard 3x3 dimension.