The aisle width (Ast) of a forklift is the minimum width of a straight aisle in which a truck carrying a given load can turn 90°.
The Ast is defined by:
3- and 4-wheel* counterbalanced trucks
*when b12 is larger than two times the internal turning radius b13:
Ast = Wa +√((l6 + x)² + (b12/2)²) + a
4-wheel* counterbalanced trucks
*when b12 is equal/smaller than two times the internal turning radius b13:
Ast = Wa + x + l6 + a