Make less noisy car, apart from machine maintenance

I have noticed that my car's tires had been producing lots of noise even there was nothing seemed to be wrong. When I got home, I noticed that many small stones got stuck with tires, even a small battery was attached there too. 

I did try to get most of them out of the tires with a sharp key. It did make less noise, and I guess when we remove these stones, we also make the tires last longer and the stones won't go too deep, and the stones won't at the same time with tires and there of course will be less noisy.

I'll probably start looking at this once in 1 or 2 months because Cambodia has a lot of roads under construction.