[Quality_Not_Quantity]

Tarmac is what it is referred to. It’s a commonly-used word, not a description of the actual material.

[D Rider]

Actually, it is an actual material. It's a British-ism. Its short for Tar Macadam, (an old type of paving.) We now use asphalt cement or not a tar based material. Typically, we call asphalt cement just asphalt or pavement, (if you do not want to be material specific.) It seems to be a favorite word of reporters trying to sound knowledgeable.

On an airport, you should describe the location such as taxiway, runway or apron. The aprons at Toranto International are concrete, so for example if it was an apron collision, then Tarmac would be a inappropriate use of terms