noun
dirt trial
A motorsport event where vehicles compete on unpaved surfaces, similar to rallying but often on a shorter, closed course.
週末にダートトライアルの大会が開かれる。
A dirt trial competition will be held this weekend.
Variant with interpunct; less common but still seen.
Borrowed from English 'dirt trial', a compound of 'dirt' and 'trial', referring to a competitive event on unpaved surfaces.