The three Pacific flyaways are all tough, but each is tough in its own particular way. At Sepang, the brutal combination of heat and humidity punishes the body and the mind. At Phillip Island, the fickle weather, which can change in the blink of an eye, always manages to catch out the unwary. And Motegi is tough because of the physical demands of the circuit, featuring the hardest braking sections on the calendar, combined with often cold and wet weather.
Motegi can really take its toll, on machinery, but especially on the riders. Braking is so tough at the circuit that the MotoGP rules specifically state that 340mm carbon discs must be used there. There are plenty of riders who paid the price of trying to run the smaller 320mm discs, their brakes overheating on the run into Turn 1 and then never really getting a chance to cool off properly as they approach the next hard braking section after crossing the finish line.
Those braking sections are illustrative of the stop-and-go nature of the Japanese track. Like Le Mans, the circuit has a bunch of straights which loop back toward each other, with tight corners in between. Once the riders exit Turn 5 and head under the bridge, they enter a more flowing and natural section. 130R is a fast right hander, which is followed by one of the better overtaking points on the circuit, the left of Turn 7, then the right-handed S Curve of Turn 8.