CDL Pre-trip Inspection Practice Exam

The required color for clearance and identification lights is amber, which is specified by vehicle safety regulations. These lights must be in a condition that ensures they are clearly visible to others on the road. Being securely attached means they must not be loose or at risk of falling off, which is crucial for safety and compliance with regulations. Clean lights are also essential because dirt, debris, or other obstructions can significantly reduce visibility, affecting the safety of the vehicle on the road.

In the context of this question, other options present incorrect colors or poor conditions for the lights. Blue lights are not typically used for clearance and ID lights on most vehicles, while cracked or burnt-out lights would not meet safety standards. A red light is not appropriate for clearance lights, and a light that is not attached or broken would be non-compliant and unsafe for operation. This reinforces that the amber color, along with being securely attached and clean, is vital for ensuring the proper function of clearance and identification lights.