The phrase "rear crash" refers to a car accident in which one vehicle hits another vehicle from behind, usually causing damage to the back of the car that was hit. Full definition
The seat / head restraints in all but three of the cars in this group also have been rated for rear crash protection. (roadandtrack.com)
For example, the 9 - 3 convertible achieves the same good front, side, and rear crash test ratings as the 4 - door sedan version. (iihs.org)
New crash test results reflect the improvements manufacturers continue to make in protecting people in front and side crashes, but protection in rear crashes lags. (iihs.org)