What safety feature is required on converter dollies manufactured on or after March 1, 1998, and how can it be identified during inspection?

49 CFR 383.115(e) ("operating practices and procedures not otherwise specified"); AAMVA CDL Manual Section 7.1.8 "Antilock Braking Systems on Converter Dollies," p. 7-1

A yellow lamp on the dolly is a quick, specific visual check a driver can use during a pre-trip inspection to confirm the dolly's ABS is functioning — missing or illuminated incorrectly, it's a red flag before ever pulling onto wet or icy roads.