Final answer:
The minimum clearance distance for an overpass for a 13'6" tall trailer should exceed the height of the trailer to ensure safe passage. A commonly recommended safe clearance is at least one to two feet more than the trailer's height, making the option of 14' - 14'2" a suitable minimum clearance.
Step-by-step explanation:
The question is asking for the minimum clearance distance an overpass must have if your trailer is 13'6" tall. To safely pass under an overpass, you need to ensure there is enough clearance above the height of the trailer to prevent any collisions. This means the clearance height must be greater than the height of the trailer. Considering factors like suspension movement, uneven road surfaces, and potential misjudgments of height, it's generally advisable to have a clearance that is higher than the tallest point of the vehicle.
Therefore, the minimum clearance distance should be more than the height of the trailer. While there is no single correct answer as clearances can vary by jurisdiction and the presence of safety margins, a common recommendation for a trailer that is 13'6" tall would be a clearance of at least one or two feet more to ensure safety. Given the options provided, a clearance of 14' - 14'2" would typically be the minimum advisable clearance that allows a safety margin without being excessive.