Are those oil spills on Chin Swee tunnel?

[Pplater]

I commute daily along Chin Swee tunnel, CTE. Can't help but notice what seems to be oil/diesel patches along both portions of the tunnel, either direction. Thing is.. I was wondering if its water or oil? Tend to avoid those... Its probably not cleared off due to the tunnel being sheltered right? Is everyone else avoiding them too? Seem like LTA doesn't quite clear it up fast enough, or do they even bother?

[Terrible One]

Dun think that's oil.. been there for a long long time already.. But then I also avoid.. Dun prey prey..

[swirlacer]

i think its water accumulated on the ceiling wall. then it drips down slllllllllloooooowlllllyyyyy accumulating cement particles along the way, thus leaving whitsh stains on the road. if u're sway enugh, u just might kanna a drop of holy water there. haha...avoid if possible.

[Spectrum]

When in doubt - Avoid!

If it's too late - Ride straight thru it...

Any lean on the bike will increase your risk of skid