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'Oil' or diesel-solvented bituminous road surface?
I'm told that HGV's often fill their fuel tanks to the brim,
then when traversing roundabouts a little too quickly,
the fuel slops out through some kind of poor overflow valve,
dumping some diesel on the road surface,
which then solvents some of the bituminous wearing layer to an 'oily' mess.
mespilus-
it could also be a water dispersal agent in the salt they use on the roads - have just found this which mentions the residue
dancing james
i stacked it going round a roundabout 15 minutes ago. one moment i was up, the next the bike had completely washed out from under me.
socks and shorts ripped, bike is fine
hands covered in oil and the hole in my sock reveals a 50 pence sized hole in my skin on my ankle, which is filled with black oily shit from the road
am guessing there may have been some oil on the road