Final answer:
When multiple containers of TIH material are leaking, the spill distance can increase due to the spreading of the material.
Step-by-step explanation:
When more than one rail car, tank truck, tank, or large cylinder containing TIH material is leaking, large spill distances may occur. This is because the leaking TIH material can travel and spread over a larger area, increasing the potential for contamination and harm.
For example, if two rail cars containing TIH material are leaking, the spill will cover a larger distance compared to just one leaking rail car. The same concept applies to tank trucks, tanks, and large cylinders.