Road Dust Control

I wonder if anybody has ideas on controlling (suppressing) dust on long gravel roads? Not necessarily out in the pasture, but on busy roads that go past houses, but would still be safe for gardens and fruit trees along the way.

Calcium chloride (ice melt) is the usual method here. Mixed in water and sprayed on the road. It pulls moisture out of the air to keep the dust moist. Works until you get a big rain or they really grade the road heavy.

So, what happens in 5 years or so, after this stuff is applied, and reapplied, and washed down into your rain water harvesting irrigation storage pond (or fish pond, or cattle watering pond, etc.)? Is it going to get concentrated and start killing fish or making cattle ill or sterilizing soil that gets watered from the pond? I imagine a guy would need special equipment and storage space to use this stuff on several miles of road?