Final answer:
RAICs use a colour coding system specific to each airport to specify the security areas individuals are permitted to access and work in.
Step-by-step explanation:
RAICs, or Restricted Area Identity Cards, use a colour coding system specific to each airport to specify the security areas that individuals are permitted to access and work in.
The colour coding system helps differentiate between different levels of security clearance and control access to sensitive areas within the airport. For example, red might indicate the highest level of security clearance, granting access to restricted areas such as the cockpit or baggage handling areas.
By assigning specific colours to different security areas, airport staff can easily identify whether an individual is authorized to enter a particular zone. This helps maintain security and ensures that only authorized personnel have access to sensitive areas.