What does a SID typically assist with?

Standard Instrument Departures (SIDs) are specifically designed to facilitate departures from congested areas by providing a structured route for aircraft to follow as they leave an airport. This helps to enhance the flow of air traffic and reduce potential conflicts among departing flights, especially in busy airspace. By utilizing a SID, pilots are guided along predetermined paths that optimize the use of airspace and ensure a safe and efficient transition from the ground to the enroute phase of flight. This is particularly beneficial in areas with high-density traffic, where uncoordinated departures could lead to congestion and increased risk of incidents.

While SIDs can contribute to improved flight safety and potentially reduce taxi times indirectly, their main function is to streamline the departure process from airports that experience significant traffic, making option C the most accurate choice in the context of what SIDs assist with.