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Although the neck is one of the least frequently injured body regions, it does play a considerable role in the solicitations of the head in side impact. It can, in fact, be said that the kinematic and dynamic conditions that govern, for instance, a head impact against a vehicle structure depend on the cervical segment. With a view to characterizing such conditions, i.e. head and neck responses, the LPB-APR conducted a research program including sled tests involving cadavers. These tests were conducted at a low and high G-level sled deceleration, respectively, with the low-violence tests being carried out following collaboration with the Naval Biodynamics Laboratory (New Orleans). Such tests enable direct comparison between volunteer data and cadaver data. The scope of this paper is to present a synthesis of the data obtained from LPB-APR low and high G-level tests, including, in particular, data obtained from new high severity tests.