True or False: Manholes are generally made of fiberglass.

Manholes are typically not made of fiberglass; they are most commonly constructed from materials such as concrete, brick, or metal. These materials are chosen for their strength and durability, as manholes need to withstand heavy traffic loads and environmental conditions. Concrete is favored for its ability to provide a robust structure and long-lasting performance, while metal options might be used in certain specific applications due to their resistance to corrosion and ease of installation.

While fiberglass can be used in some applications for utility or access purposes, it is not the standard material for manhole construction. The misuse of fiberglass in this context would not meet the necessary structural requirements for manholes, leading to potential safety hazards. Therefore, the assertion that manholes are generally made of fiberglass is incorrect, confirming that the answer is indeed false.