I used to see lights like this in my city all the time, it's ridiculous.

louvers aren't designed for cutaway visors. The signal here is about 30 years old (LEDs are newer than the body), and the louvers look about 70 years old. They're horizontal for distance limiting.

Don't worry, I don't think they will be there much longer

You'd be surprised how long stuff lasts in the field

Wow! I haven't seen louvers for many years! They are usually in vertical format.

Where these removed?

What are louvers? What are they supposed to do?

louvers are those blinds put in the visors of some signals. Most are set vertically to blankout signals that are aimed at a skewed approach. They're a cheap way to visibly limit to a specific lane. When set horizontally they are used for distance limiting.

Oh I see. Did the top one on this fall off?

It doesn't look like there ever was a top one - note the absents of screw holes

The top probably didn't have the louver. When you distance limit you want to blank out greens (and/or yellows) at closely spaced intersections so when you are at an intersection the nearby intersection signals appear blank. Then as you drive towards the nearby intersection the greens appear. Thats the point of limiting the distance.