Contractor vehicles working under CDA escort should have what mounted on top?

Contractor vehicles that are working under the Chicago Department of Aviation (CDA) escort must have yellow or amber rotating, strobe, or LED lights mounted on top to enhance visibility. This requirement is crucial for safety in high-traffic airport environments where clear communication of the vehicle's presence is essential. The use of yellow or amber lights is a recognized standard in many industries, particularly in construction and maintenance zones, as they alert other drivers and personnel to the presence of temporary work areas or moving equipment.

These lights serve to increase awareness among other drivers and airport personnel, helping to prevent accidents and ensuring that the contractor vehicles are easily identifiable during operations. In contrast, other types of lights such as red emergency lights or flashing blue lights may carry different meanings and are typically reserved for emergency services or specific types of traffic situations. Hence, the presence of yellow or amber lights specifically indicates a need for caution without implying an emergency response situation.