Someone smart on Twitter this morning said that today was Black Ice Friday - our version of Black Friday in the US.
School buses are cancelled, the roads are treacherous, and I am staying home with the kids for the day.
It doesn't look all that dreadful outside. That's the danger with black ice - you don't see it.
But as I watched the dog slide down the steps and claw her way back up again, I realised that if I want to go out to the car to get the work I have to do (which I left in the trunk, silly me), I might need these: