My 2 cents:

I don't go out much at night.

The only place I've seen the blue lights are along a dead-end road that leads to gated HOA's where the minimum price of a house is 700k and many are worth multi millions.

Really heavy duty "important" peeps live in these 2 neighborhoods.

Not all of the lights are blue.

I haven't done a complete examination of the lights,but it seemed like they were spread out evenly - every other one.

All the lights had been working,so there was no reason to replace them,in my opinion.

They were replaced very recently and they were alternately aligned for some specific reason.