In Tom Wolfe's "The Right Stuff" and in 1940s engineering, there was a demon in the air at 750 miles per hour, a line some said could not be crossed. It was called the Sound Barrier for that reason.
If that demon could cause a plane to break apart in air, imagine what it would do to a car on the ground.
We'll find out in 2015. The BLOODHOUND SSC will make a test run at almost 800 MPH in 2015, which will beat the current official land speed record of 763 MPH, and will attempt 1,000 MPH in 2016. To keep her between the ditches, engineers will have to model how the car will cope with the supersonic rolling ground, rotating wheels and resulting shock waves in close proximity to the test surface at Hakskeen Pan, South Africa.