Which of the following must be considered during the installation of sewer systems subject to vehicular traffic?

When installing sewer systems that will be subjected to vehicular traffic, the choice of pipe material and encasement is crucial due to the need to ensure structural integrity and durability. Sewer pipes must be able to withstand the weight and pressure from vehicles above, which can lead to potential failure if not adequately supported or if the wrong materials are used.

For instance, heavy-duty materials such as reinforced concrete, ductile iron, or specialized plastic pipes designed for high load-bearing applications are often recommended. Additionally, the encasement of the pipes in protective materials can help protect against external loads as well as reduce the risk of damage from ground movements or shifting soil conditions. This ensures long-term functionality and reduces maintenance costs.

While soil condition, traffic volume, and water table levels are indeed important factors to consider in sewer installation, they do not directly influence the specific design and material choices of the pipes themselves when it comes to coping with the stresses imposed by vehicular traffic. Therefore, focusing on pipe material and encasement is the most pertinent consideration in this scenario.