Active side marking in action:
This is half a set of an automotive wheel well lighting system (i.e. two light bars) which I bought off eBay for like $80. I'm powering it with an 8 cell AA pack, which I have in a kit box along with the CPU; the lights have many flash, intensity and color modes.
The other two light bars I have on my sidecar, and when it's attached, I can easily route the leads to the CPU, giving me all 4 light bars illuminated. It's quite a show!