Which MAAS uni-directional installation requires the removal of a tire?

In the context of multi-layered pavement structures, the installation of a concrete uni-directional system may necessitate the removal of a tire due to the specific requirements for embedding and locking the installation into the substrate. Concrete installations typically must achieve a solid and stable foundation to endure heavy loads and traffic.

Removing a tire allows for proper installation depth and ensures the concrete can bond directly to the underlying material, creating a sturdy foundation. This step is crucial to prevent future cracks or failures due to inadequate support beneath the concrete.

In contrast, soil, asphalt over soil, and asphalt over concrete do not typically require the same removal of a tire, as these materials might allow for adjustments or compaction without necessitating such extensive preparatory work. Thus, the focus on concrete's unique requirements makes this the correct choice.