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In page Rallying:

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Groups T1 and T2 codify cars used in FIA cross-country rallies. Group T5 (T4 prior to 2020) was introduced to allow support trucks to enter the rally raids in their own class. Groups T3 and T4 are reserved for side-by-side vehicles and lightweight vehicles, these differ from cars by not having notable parts such as windscreens or doors.[citation needed] Group T6 and Trophy truck.