Wheres the problem?
Ive been driven on the back of an R6 at 156 before and , while the numbers seem big , you must remember that other road users in the fast lane will be going at around 70 too. Bikes are much more agile than cars , especially when it comes to high speed , i dont personally go at those kinds of speeds (partly cos i dont want to lose my licence , partly because im never out of the city and partly because im not really the type) but given the right precautions , why not?
I mean if you were to see the laws view of that kind of driving , its classed as dangerous driving right? Well sure it is if you are driving dangerously (ie , swerving all over the place , filtering at those speeds , generally being a bit of a dick) but if you were to ride in a straight line , on the right section of the lane , avoiding the blind spots of other users , you are in clear view of anyone using their mirrors , you are allowing yourself room for error if someone pulls out on you , you have a better view of the traffic on your left hand side , have a smaller chance of getting hit by spray on wet days , generally driving safely right?
This is why I think speed limits for bikes should be a bit higher. Not much , maybe about 10 mph or so and i know people will call me a statistic for saying this but seriously , think about it.
Also that unmarked police driver was doing 100mph right next to rider. Isnt that dangerous driving? He then overtook him using half a car width (huge demonstration of dangerous driving) then flashed his lights , I assumes , and pointed the rider to the side of the road. Those lights could have startled the rider too , possible causing a crash. Both riders then pulled over a little too quick for my taste , but then im the slow ride type. I doubt he had lights on before he overtook the rider.
Undertaking at those speeds is another kettle of fish though.