[Jim Noble]

I like this design:

Ask the Han if walls work.

[jonrick46]

This is the design Trump tweeted. I think it will have a cross piece near the top, to pull it all together.

[caww]

Should have razor wire on top/side as well.....

[American in Israel]

Too easy to pass drugs through.

[HandyDandy]

Are we talkin’ magnetic Steel, or are we talkin’ non-magnetic Steel?

[newnhdad]

I want to be able to see it from space.

[GenXteacher]

A minefield might be suitable.

[pacific_waters]

it’s a start but no razor wire, landmines or mg’s? Get busy.

[pacific_waters]

it’s a start but no razor wire, landmines or mg’s? Get busy.

[EinNYC]

The Bollard fence is not sturdy enough. Also, it will eventually rust. It would be very expensive to coat it or paint it and the job over the whole length would never be finished; by the time the end was reached, the first part would need painting again.

If you put any crosspieces horizontally, they'd be used to throw a grappling hook over. I think they need a solid wall, with heavily barred "windows" at intervals to let the Border Patrol take their peek. The "windows" should be barred in such a way as to preclude any hooks being anchored in them. The top of the wall should be crowned with razor sharp concertina wire, in case anyone managed to near the top. Automatic guns, like Israel has, should be mounted at intervals. The wall should extend at least 15 feet below the earth's service, and vibration detectors should be installed and monitored. Every other mile, there should be a small passageway to allow wildlife such as jaguars, lizards, and other non-flying animals to safely migrate, but not big enough for humans to get through. These wildlife openings should be remotely monitored.