What is the maximum overall length for a tractor and its towed load (excluding fire vehicles), including load and bumpers, and how many LD-3 or LD-7 units may be towed?

• A. 85 feet; no more than five LD-3 dollies or four LD-7+ trailer units
• B. 75 feet; no more than six LD-3 dollies
• C. 95 feet; no more than three LD-7 trailer units
• D. 60 feet; up to eight LD-3 dollies

Answer: (A)

Maximum permissible length for a tractor and its towed load, including the load and bumpers, is 85 feet. This limit keeps the combination within safe maneuvering space on airport roads and pathways. In this context, LD-3 dollies and LD-7 trailer units are the standard towing units used to move cargo, and the rule allows up to five LD-3 dollies or up to four LD-7 or longer LD-7+ trailer units. Fire vehicles are excluded from this length restriction, which is why the rule specifies that caveat.

So the correct combination is 85 feet total, with no more than five LD-3 dollies or four LD-7+ trailer units. Any option that exceeds 85 feet or that uses more than the allowed number of LD-3 or LD-7 units would not fit the rule.