Ken RM

I recently purchased a 2021 Prius Prime Limited and am unable to find answers to some questions in the owner manuals: 1. What is the meaning of beeps that do not include a visual warning. I often hear two beeps and occasionally five beeps. The only answer that I can find in the manuals is that it may beep when it sees a speed limit sign. That does not apply to nearly all of the beeps that I hear. 2. What is the meaning of the various lines in the Lane Tracking system. I usually see two solid (good lane detection) or hollow (poor lane detection) lines in white or yellow. What is the difference between the colors? I often see green lines outside of the white/yellow lines. What do they mean? I once saw an orange line inside of one of the lines. What does that mean?