Fans vs faces

Hi all,

I was wondering about the following. It appears to me that 99% of the 
0.9.7/8 FG scenery is solely made out of triangle fans. Only a few tiles 
use triangle faces, mainly near the poles and airports. This seems a little 
odd to me. For example, I assumed all roads and rivers would have been 
triangle strips, but instead those consist of multiple fans too.

Can anybody explain me why this is the case? Any particular reason or design 
issue I'm overlooking?

Thanks in advance,
--Ivo


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