From theoretic tell, no matter use much taller speed of a motor vehicle,bend too to average car won't to turn over; And because high speed turns,the reason of to turn over is not, when be being bent too quickly too because of speed however because turn to inadequacy (van car) make car head bumps outside side obstacle brings about to turn over, also or when high speed crosses a turn because change direction excessive (hind drive car) make car head bumps into inside obstacle to bring about to turn over; In other words because if it were not for turns to inadequacy, change direction excessive cause appearing collision, want to drive the car breaking up is very difficult; But the model of the on the high side of a few centre of gravity such as SUV, Pi Ka, small area is below specific situation the possibility that exists to break up!
The car is in when producing collision, drive the car what the requirement needs when breaking up by right of speed only, the list moment of force of the generation when that must make sure the car changes direction namely is more than steady moment of force; Issue a car to just be likely below the condition of high speed travel in this kind of circumstance only be left to break up, but still be that word daily to us civil car is accomplish list moment of force to stabilize pitching moment more than likely hardly of this kind of condition, cannot break through this critical value, do not have method to bring about to turn over; Below the case that there is the list acceleration when car high speed is too curved to exceed critical value only below the circumstance normally, just bring about side to break up likely, and the critical value of this list acceleration is in as the car character 1.4G above (specific algorithm has formula, calculate through taking the centre of gravity of the car, Che Kuanlai) , wider, centre of gravity jumps over the car low, this critical value is greater, this exceeds namely run look wide low bend over; And this the greatest critical value is being reached when wanting to cross a turn in high speed as average family expenses car is impossible, because of tire the biggest catch soil fertility insufficient! 
Why can the car advance quickly? Relied on tire namely catch soil fertility, only tire captures ground car ability to move; Should quicken G value to exceed tire the biggest when catching soil fertility, the wheel becomes sliding friction by rolling friction, this moment also begins drift, so speed also was restricted, so the G value of list acceleration also is continueing to rise and break through the greatest critical value; No matter,so the car falls in the situation that does not produce collision much higher speed won't side breaks up, because of tire the biggest catch soil fertility insufficient, the biggest acceleration of a 0.8G also can be developed at most when the tire of our civil car is too curved, broke through begin to skid, the force of list also discharge went out, what be put in side to break up far from is likely (this is put on the ice in the level namely any cars drive on the face, want not to collide only, absolutely won't to turn over, because of tire catch soil fertility to be broken through too easily, one breakthrough skids discharge force is natural won't to turn over) , think a civil car to open the list acceleration that break up critical value is in at least 1.4G, and tire can accomplish 0.8G only in moving actually, using this tire so do not have method to achieve the list acceleration of the car 1.4G, also just began to skid to 0.8G, should skid only the risk that breaks up without side (produce collision except) ! 
The field that even if is F1 and so on cycle racing, use hot frit fetus deserves to go up appropriative circuit can make tire achieves 1.5G taller even the biggest catch soil fertility, but the centre of gravity that also did not forget F1 exceeds low, air to cover action, make the critical value that causes his side to turn over acceleration of the biggest list greater also, normally the too curved limit of F1 is controlled in 4 G normally (the turn of 5 G was done not have almost now) , so even if is field the tire of cycle racing is the biggest caught soil fertility to also do not break through force of this the biggest list, still won't have an any possibility that break up so, produce collision side to turn over except of course; So informal high speed bends the car too, should not collide only absolutely won't side breaks up, if want to drive family expenses car,break up, only so little that on one heats up frit embryo, go up circuit, and the car still cannot be athletic model (centre of gravity is best a few taller) , must return a few more narrowly, rise speed leisurely below this kind of condition only the critical cost that high speed bends ability to break through the biggest list to be blocked up quickly likely too, bring about side to break up, but this kind of means does not exist with the life in; Actually as to SUV the truth is mixed the car is same, cross a curved even if to also do not have a thing again quickly alone, but SUV is afraid that frequent left and right sides changes line, namely the setting that imitate elk checks, below this kind of condition, SUV as a result of higher heart, longer pensile list extent, successive left and right sides changes line, the pensile itself that can cause a car gains partial strength, can imagine we play in one's childhood " tumbler " , frequent apply thrust augmentation to measure it to be able to begin to its left and right sides from rock, SUV left and right sides changes often the line also is this truth, this moment considers cannot be a wheel only the biggest catch soil fertility, catch the wheel soil fertility? The moment of inertia that pensile place stores, so one overlay brings about the SUV with this kind of high heart, soft suspension likely to change often the state that list moment of force appears to be more than critical value when the line, also give broke up; So SUV is in urgent change for many times line from time to tome the likelihood that side turns over, but just bend together too alone, even if speed is again fast, basically do not collide to also won't break up! 
