JJ Keller Entry Level Driver Training for CDL (Commercial Driver’s License) Practice Test 2026 - Free CDL Practice Questions and Study Guide

The minimum clearance distance required for overpasses when operating a trailer that is 13.6 feet tall should exceed the height of the trailer to ensure safe passage without risk of collision with the overpass. The appropriate clearance distance typically accounts for additional safety margins and variations in load height, road camber, and other factors.

In this case, choosing a clearance of 14 feet is correct because it provides a minimum buffer above the trailer's height. This ensures that even under various conditions, the trailer can safely clear the overpass without any risk of contact. The 14 feet is an industry-standard recommendation for ensuring safe clearance for vehicles of this height, factoring in additional safety allowances compared to the trailer’s actual height of 13.6 feet. The other options either do not offer sufficient clearance or exceed typical necessary margins, making 14 feet the most practical and safe choice.