This technique can be used on a ditch, uncovered gutter or trench, on either gravel or tarmac, where the gutter depth is bigger than the tires. This would require load shifting techniques. Cornering at maximum speed places the majority of load on the two outside tires. Accelerating at that point causes increased load shift to the rear tires. Then both outer side loads are borne only by the rear. That means the driver intentionally creates a strong load shift and reduces as much load as possible from the inner side front tire. It allows the car to float the inner side tire above the ditch while taking the corner at maximum speed. If you can do that, then at full throttle, you can go directly above the ditch.
Load transfer is done with cornering & balance. Simply put most load transfer is kick gas and load to rear. Brake/Shifting sends load to front. Side transfer is connected to steering work. If side balance transfer doesn’t work out well, understeer or oversteer happens.
Actually a ditch run is not as dangerous as it looks. Provided the ditch is free of obstacles, it is not only faster but also safer than just using the width of the road. Just need to care about exit point. The best that can happen is spin 180 degrees, cut the clutch to regain tire grip and ending without hitting anything or crash.
Definition of Load transfer in cars is, “Load transfer is the measurable change of load borne by different wheels during acceleration (both longitudinal and lateral). This includes braking and deceleration (which is acceleration at a negative rate). No motion of the centre of mass relative to the wheels is necessary, and so load transfer may be experienced by vehicles with no suspension at all.”
Further reading:
1.
Tyre and Vehicle Dynamics (2nd ed.) by Hans B. Pacejka – Book PDF download link:
https://drive.google.com/file/d/1NBq7xRb8NajEJ3osPAEVT3t6x-dtGJX3/view?usp=drive_link
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