The picture above is of the first segment completed, in Calexico, CA. Back then (FY17 only), the appropriation restricted the design, to only pre-existing designs.
In most places since, they have the anti-cimb plates at the top (5 foot high flat plate). In urban areas, it is mostly 30 feet high. The Military deployment to the border has been extended through FY20, and a portion of them are Engineer troops, who are still going behind construction crews and stringing concertina on the bollards. Two or three rolls of concertina, thirty feet up in the air, is a really terrifying thing to encounter.
The bollards main weakness against common people (vs. cartels) is ladder and rope assisted climbing. 30 foot height, anti-climb plate and concertina are each very effective at defeating or deterring a lot more climbers.
Even though that Calexico barrier from the photo lacks an anti-climb feature at the top (the rounded barrel top, or the common anti-climb plate), the Military has since added concertina to the 2.25 mile segment in that picture (West of the Port of Entry). This shows the configuration of the concertina that has been added to that segment of barrier (American side):
In addition to 30 foot barrier, that segment also included improved road, stadium lighting, persistent day/night camera surveillance from the command post, as well as additional sensors and alarm systems.
That area (right across from an outlet mall), used to lead the Nation in attacks on Border Patrol Officers. Those attacks dropped 85% immediately as the bollards went in, even before the concertina.
Currently, construction is underway on 11 miles of 30 foot "wall system" (the total package of bollards, roads, lights, cameras, alarms and sensors) on the East side of the Calexico Port of Entry as well.
On 3 September, the Secretary of Defense authorized Military Construction funds to build a secondary bollard barrier through Calexico as well, so they would have to get over two of them (each 30 feet high, with Border Patrol vehicles able to race up and down between them).
San Diego has their new Primary barrier complete (mostly 18 foot bollards with anti-climb plate), and 10 out of 14 miles of 30 foot bollard secondary barrier complete (on schedule to complete in January. Apprehensions are down 90% already, and the remaining apprehensions are all (ALL!) where the secondary barrier is not yet complete.
Double barrier bollard wall system is super effective.
Before, it was child's play to get over, under or through the old Primary barrier in San Diego, and the old Secondary was breached (cut through) two to three times per day on average. So far, only four attempts to breach through the new Primary bollard barrier have been attempted, and none have succeeded. San Diego is the biggest city on the border, facing one of the strongest and wealthiest drug cartels (Sinaloa Cartel, averaging 5-6 murders per day in Tijuana alone, often with terroristic torture and desecration of the bodies). If it works there, it must be a rock solid system.