Legally, you only need to indicate that you're changing lanes. Technically you can get away with only one signal and be within the law. 3 is perfect for me if there's not a lot of traffic but I will just turn the signal on when there is, so that they know my intentions with plenty of time.
Once upon a time I had:
2012 SGM SEL Sedan Job 1 BD 6/2011
FSWERKS Cool-Flo w/ ITG Filter | FSWERKS Stealth Exhaust | 17x7.5 Axis Sport XMX Graphite wheels | Eibach Sportlines on Ti Handling Pkg bits