TLDR: LA suffers from "heat island" effect, so to lower the temperature at the street level they're coating streets with a sealant. The company that manufactures the sealant previously developed sealants for the military.
Before I clicked on the article I was trying to figure out how coating a city's streets would somehow prevent spy planes from being seen. I didn't even want to try and crack why this might be necessary.
"Luzar said the officials were interested in lowering the temperature of taxiways so that aircraft would be less easily seen by spy satellites using infrared cameras, which form images using thermal energy."
For sensational titles, I'm developing a habit of checking the comments first. It seems to be working :).