Final answer:
The minimum effective width of the landing at the top of construction stairs is 36 inches to ensure safety and accessibility.
Step-by-step explanation:
The minimum effective width of the landing (or platform) at the top of the construction stairs is 36 inches. It is essential that a landing be of sufficient width for safety and accessibility purposes. In most building codes, the standard minimum width of a landing is 36 inches. This allows enough space for a person to stand comfortably, maneuver and, if necessary, allows for the passage of equipment or other people without risk.