Final answer:
You should signal at least 100 feet before making a turn or lane change in a residential area, though this distance can vary based on local traffic laws.
Step-by-step explanation:
When driving in a residential area, it is important to signal your intentions to other drivers. In the United States, traffic laws commonly state that you should signal at least 100 feet before you turn or change lanes.
It's imperative to check the specific traffic regulations in your local area or state because this distance may vary. Signaling in advance helps to ensure the safety of all road users, including pedestrians.