It's not winter at the Mudcat
without a link to Scotland's Trunk Road Gritter Tracker.
The OP on this thread, the link is kind of indirect,
you have to go through a layer or two to get to the actual site.

I'll see if I can link directly to it. Here goes.

Transport Scotland

yay, me!
And if you zoom in and tighten on a smaller group of vehicles
in a smaller area,
the named ones have their little names pop out.