Final answer:
When exiting a highway, it is recommended to signal at least 500 feet before reaching the exit ramp.
Step-by-step explanation:
When exiting a highway, it is recommended to signal at least 500 feet before you reach the exit ramp. This provides sufficient warning to other drivers and allows them ample time to respond and adjust their speed or lane position if needed. Signaling well in advance helps to prevent sudden lane changes and reduces the risk of collisions.