What do the icons mean?

[taniwha-qf]

You can't hear that in a firefigtht and condensation won't tell you when you can sprint again so you have to constantly mash the button.

Actually, you don't. Just release and press-hold again. You'll start sprinting again when you can. Also, it's only a few footsteps (maybe 10?) that you can't sprint.

 

[Codger]

Unless I'm remembering wrong, the person with a line through it will light up if you're in a restricted area. The "blob" one is actually a gun and I believe it's telling you weapons are prohibited where you are. It won't light up if you're doing a scavenger raid, for example.

No, it's as Bozo said, they light up if you're seen in a restricted area, or with your weapon drawn, respectively. (I tested it).

They stay lit even if you leave the restricted area or holster your weapon. It's just a way for the game to show you that you've received a warning on those, and the next time you're seen you'll get fired upon.