How is the presence of ABS on a trailer typically identified from outside the vehicle?
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Correct answer to question 120 (Combination Vehicles): A yellow ABS indicator lamp is mounted on the left side of the trailer, visible during a pre-trip check
Why
Trailers equipped with ABS typically have a yellow malfunction lamp mounted on the left side, which a driver can check during the pre-trip inspection to confirm the system is present and functioning.
Updated: November 2026