Inertial dampener
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The Third Doctor modified Bessie with inertial dampeners.
The dampeners were effective when the Doctor drove over a small humpback bridge in Bramfield New Town, although Miss Barnett still felt as though she might vomit. (AUDIO: The Hidden Realm [+]Loading...["The Hidden Realm (audio story)"])
The Doctor told Jo Grant that she would not get nauseous reading inside Bessie because of the inertial dampeners. (AUDIO: The Rise of the New Humans [+]Loading...["The Rise of the New Humans (audio story)"])