This document discusses vehicle-borne terrorism and diplomatic security. It notes some major terrorist attacks using vehicle-borne improvised explosive devices (VBIEDs) that killed hundreds in Beirut, Oklahoma City, Kenya, and New York. The document examines US policy implementations from 1983-2008 aimed at preempting, maintaining the status quo, or deterring VBIED attacks on diplomatic facilities. These include implementing standoff distances in 1985, delta barriers in 1999, and man-traps in 2004. The expected findings are that standoff distances would reduce lethality, while delta barriers and mantraps would reduce the prevalence of VBIED attacks on diplomatic facilities.