Still, they all need reverse razor wire at the top facing Mexico. It's worked in California, and that "wall" is just a double fence with a road between with lights and sensors. It cut illegal crossings by some 95% and the reason that the illegal crossings became such an issue in southeast Arizona that has nothing but a 5 foot barbed wire fence or nothing in that area.
Remember the Minutemen? I was one of them and drove I-8 from San Diego out to Tuscon and down to Tombstone to stand watch. I've seen and contrasted the differences and what has worked and what is needed.
Contrary to popular belief, we don't need such huge barriers all along the southwest. There are such large expanses of deserts that are miles and miles from the Mexican border that are too far from staging areas where the illegals can meld into. It would take an entire Army logistics division to get them across that wasteland. Look on a map.
That said, there are areas in eastern Arizona and parts of New Mexico that need such barriers in certain areas. The main problem is Texas. Because they have Mexican towns so close all along their border, that's where we should build first.
I know they have to address one area and then look for solutions in another area.
But what do they do for the influx coming in from the far east, Asia, etc? Some data
is beginning to show these numbers to be as high or higher than from the South.
“what is the deal with the round top?”
If you are trying to free climb, those big round tops are showstoppers. The small round top is a significant challenge, especially at thirty feet in the air, where a slip can mean a broken bone, or worse.
Both kinds of round top counter grappling hooks from getting a grip.