[loloquwowndueo]

If it’s dark, both rear red lights will be on. It could be motorcycles, if they are really close together but that sounds unlikely.

[shotta]

What I failed to articulate (I can’t get my brain to boot this morning) is that a decent amount of motorcycles use arrows as their turn indicators. When I see a blinking arrow at night, I assume it’s a bike.

[loloquwowndueo]

Just be careful, as you can see from this article it might not be the case. Better to be on the lookout and don’t assume things :)

[codeduck]

Even in the event of failed lights, the clusters have reflective sections that will illuminate in response to your own lights.