In Britain the test consists of three parts, theory, which includes traffic law, bike maintenance and safety, basic training, which includes bike handling skills, for instance riding around an obstacle course, slow riding which involves riding at walking pace without putting your feet down, emergency stop, and avoiding a vehicle, the last one is supposed to show that you can get around a vehicle that has pulled out on you, you have to ride towards a barrier of cones at twenty miles per hour and when the examiner raises his arm you have to flick the bike around the barrier which represents a car, needless to say there have been several accidents, one very serious and the examiners and trainers have complained to the DOT that this part of the test is dangerous and unrealistic.
The third part of the test is on the road in normal conditions, which in London means gridlock, you must make progress by filtering and adhering to traffic law the examiner follows behind and is linked by intercom, if you wish to ride a bike above 33bhp there are other things you need to do, you can no longer pass your test on a small bike and then buy a large cc machine.
If all this shit was in force when I first started riding I doubt I would have got a bike, for me and my mates a bike was the cheapest and easiest route to mobility, you sent off for a provisional licence, went down the dealers bought an RD250/GT250/KH250 stuck an L plate on and off you went.
Later on they introduced compulsory training and restriction to below 125 with L plates, this system was fine, it reduced accidents and encouraged people to get training and take the test so they could get a large bike.
Since I first started riding the bike test has changed several times, getting tougher along the way, whereas the car test has hardly changed at all, this shows there is a bias against motorcylists.