It's a black ice warning...ie: temps are such that black ice can form on the road. The warning will only come on at +3C...if you're below that, it won't chime on...it's the crossing of the temp threshold that does it.
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Richard
2013 BMW M3 Individual -- Fire Orange (sold)
2013 BMW X1 xDrive35i M-Sport -- Valencia Orange (sold)
2011 BMW 1-series M Coupe (#205/220) -- Valencia Orange (sold)
2009 BMW 135i M-Sport Coupe -- Space Grey (sold)
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