all things considered, this incident seems rather sedated comapared to some encounters i've seen recently involving cyclists and motorists!
but still, this sort of behaviour is usually a precursor to something a little more physical...
I think it's only sedate because the car is matching the speed of the cyclists. To me, the driver is being deliberately threatening and intimidating.
I also think the two cyclists were incredibly restrained, as I would just have stopped and asked the driver WTF his problem was.
The point in posting this, is that we should not have to put up with this sort of cr*p, nor the verbal abuse and the "you don't pay road tax" type comments that I have has countless times while riding my horse, while riding on open quiet country roads (or anywhere else for that matter).
Strangely, around here the worst offenders are always old men