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" First Fence It was started in 1990\u2014a 14-mile-long, 10-foot-high barrier of welded steel that extended east from the Pacific shoreline south of San Diego.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=32.539313,-117.065895&amp;amp;amp;spn=0.000334,0.000536&amp;amp;amp;z=20&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map Landing Mat  Named for portable touchdown pads used by helicopters operating in Vietnam, landing mats form panels 12 feet long, 20 inches wide and 1/4 inch thick that are welded to steel pipes buried 8 feet deep. A mile of fencing requires 3080 panels.   frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=32.67472,-114.74503&amp;amp;amp;spn=0.001332,0.00214&amp;amp;amp;z=18&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map The Long Wall The 123-mile-long vehicle fencing along the southern boundary of Arizona&amp;#039;s Organ Pipe Cactus National Monument forms one of the longest continuous physical barriers on the U.S. border.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=31.954493,-112.836456&amp;amp;amp;spn=0.34373,0.55069&amp;amp;amp;z=10&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map Anti-Ram Fencing It extends 15 feet aboveground and 6 feet deep to deter tunnelers. Expensive but difficult to defeat, this type of fencing can stop a 10,000-pound vehicle traveling at 40 mph.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=31.332608,-110.934067&amp;amp;amp;spn=0.001352,0.00214&amp;amp;amp;z=18&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map Normandy Fencing  Named for the X-shaped barricades on Normandy beaches during D-Day, this fence type is designed to impede only vehicles.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=31.333854,-109.371541&amp;amp;amp;spn=0.001352,0.00214&amp;amp;amp;z=18&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map  cellspacing=&amp;quot;0&amp;quot; cellpadding=&amp;quot;0&amp;quot;&amp;amp;gt;  --&amp;amp;gt;  Bollard Fencing Typically 6 feet high and embedded 5 feet deep in a concrete base, this is built at small enough intervals so that it&amp;#039;s impassable to vehicles but not to wildlife\u2014or humans on foot.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=31.774549,-106.521281&amp;amp;amp;spn=0.002691,0.004281&amp;amp;amp;z=17&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map Vehicle Fencing Half of the 650 miles of barriers along the border are designed to stop vehicles only. The rest, like the fencing in Presidio, Texas, is to halt foot traffic.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=29.305486,-104.005165&amp;amp;amp;spn=0.02208,0.034246&amp;amp;amp;z=14&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map Steel/Wire Mesh  Installed in varying heights and designs, these fences are relatively economical to build but easily compromised by cutting and tunneling.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=29.074456,-100.664098&amp;amp;amp;spn=0.005532,0.008562&amp;amp;amp;z=16&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map Picket Fencing  It&amp;#039;s designed primarily to soften the symbolic and visual impact of a barrier on both sides of the border. The Secure Fence Act calls for 130 miles of this 18-foot-high metal pedestrian fencing to be built in Texas, mostly near urban areas and international bridges.   frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot; marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=27.626661,-99.579048&amp;amp;amp;spn=0.022433,0.034246&amp;amp;amp;z=14&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map Segmented Protection The proposed fencing for 21 locations in the lower Rio Grande Valley will range in length from 1 to 13 miles.  frameborder=&amp;quot;0&amp;quot; scrolling=&amp;quot;no&amp;quot;marginheight=&amp;quot;0&amp;quot; marginwidth=&amp;quot;0&amp;quot; src=&amp;quot;http://www.google.com/maps?ie=UTF8&amp;amp;amp;t=h&amp;amp;amp;ll=25.975947,-97.614212&amp;amp;amp;spn=0.091049,0.136986&amp;amp;amp;z=12&amp;amp;amp;output=embed&amp;quot;&amp;amp;gt;View Larger Map  cellspacing=&amp;quot;0&amp;quot; cellpadding=&amp;quot;0&amp;quot;&amp;amp;gt; U.S. Border Fence Technology &amp;amp;gt;&amp;amp;gt;&amp;amp;gt;  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/military/a6028/us-southern-border-fence-tech-map/>