What action does 'Code 3' instruct law enforcement officers to take?

'Code 3' specifically instructs law enforcement officers to respond to an emergency situation with both siren and lights activated. This response indicates that the situation is urgent and requires immediate attention.

Utilizing sirens alerts the public and other road users to the officer's presence, ensuring they can navigate safely to the scene. The lights increase visibility, further emphasizing the urgency and importance of the response. In emergency situations, this combination of siren and lights helps to facilitate a faster response while maintaining safety for both the responding officers and the public.

The other options do not align with the urgency implied by 'Code 3.' Routine checks and securing areas are more cautious and methodical approaches that do not convey the immediate need to engage quickly with a developing situation. Initiating a pursuit may involve high-speed driving, but it is not the primary directive of 'Code 3,' which is specifically about responding to emergencies.