2 white or amber lights in front and on red at the rear of the vehicle. Part VI section 62.(1) for minimal lighting on a vehicle. For conspiciousy.
My rule of thumb, if its there, it must work regardless. Esp at the commercial level on an annual safety inspection.
I do recal inspecting and older vehicle from head to toe, only 3 lights were factory installed and mandatory at that time. Still legal to this day.