ANC - apron positions in lighter colour

[jettison valve]

Hi,

I´ve been wondering about a number of apron positions in ANC / PANC:
Resembling roughly the shape of an airplane (fuselage plus wings), a part of their surface is much lighter in colour than the surrounding areas:

https://maps.google.de/maps?q=panc&l...=panc&t=h&z=16

Any ideas about the reason?
Are those light areas.... heated...? Or is a "high-friction" material used in these areas?

Thanks for any hints!
J.V.

[gayford]

My guess is that they are concrete areas that have been constructed to increase the PCN and reduce the problems caused by fuel spillage etc, etc.