Read a strange METAR

[Whitebug-speed]

I recently picked up a METAR with the following :

R11/0170V0300D

Any ideas on what that means.
I suspect that it has something to do with visibility on runway 11, but can't be 100% sure.

So any metmen out there with the correct answer?

['%MAC']

R11/0170V0300D

Runway 11 visibility 170 variable 300 meters Down visibility trend