Is it time to start calling out bad cyclists?

109: Areas of white diagonal stripes or chevrons painted on the road. These are to separate traffic lanes or to protect traffic turning right.

If the area is bordered by a broken white line, you should not enter the area unless it is necessary and you can see that it is safe to do so.
If the area is marked with diagonal stripes and bordered by solid white lines, you should not enter it except in an emergency.
If the area is marked with chevrons and bordered by solid white lines you MUST NOT enter it except in an emergency.

Not sure who gets to define 'necessary'.