For communication lines crossing public streets, highways, commercial driveways, and parking lots, the minimum vertical clearance is often set at 15. sured at the lowest point of sag within the span to the surfa s, parking lots, and alleys. If accessible to pedestrians only, 12 feet is permiss e to residential buildings only. Trucks larger than 8 feet in height riders. For areas such as sidewalks, backyards, and alleys where only foot traffic is anticipated, the National Electrical Safety Code (NESC) generally requires a minimum vertical clearance of 9. This height is considered sufficient to allow safe passage for individuals, even. The Fiber Optic Association, Inc. FO-VC2 JOINT USE - VERICAL MIDSPAN CLEARANCES 48. Barn likely to have truck traffic. Trucks are defined as any.
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