RE: Cat's Eyes
We have them on this side of the pond as well. One of their intentional properties is to provide tactile feedback when one wanders across the lane boundary. Yes, they are a major issue for motorcycles as compared to the minor nuisance for 4 wheel vehicles.
There exists a version of these where the lights are set into depressions in the pavement rather than projecting above it. This configuration might produce less road rumble (or plane bump). But there may be adverse maintenance issues with them (depressions collect water).