And that nod often leads a driver to just pull out into the path of a two-wheeler without looking, so fuck them, fuck their nods, and fuck their whining about robocars meaning safer driving.
their in this case being the CTC who produced the above image as a warning that robocars will be a new set of issues in addition to the existing issues.
From the image... it's nods in other cars... i.e. when you're in a car waiting to turn onto a road, and a car pauses and nods for you to quickly go.