The authors had provided the background to, and highlighted the importance of, testing vehicle security barriers (VSB) to prevailing Test Standards. This paper provides an update of surface-mounted VSBs in view of the recently-approved International Organization for Standardization document that has superseded previous Standards where they have been specified in many security projects around the world. The current US Standard remains applicable as a compliant document although this is mainly used outside of Europe. The differences between the ISO document and a previous withdrawn Standard are stark. The classification of test results in ISO now includes, inter alia, debris of a lower mass, different penetration measurement points, and an increased number of vehicle types to reflect a global vehicle fleet. This paper addresses many of the issues that may require risk assessors and security engineers to rethink new threats going forward. A comparison of the major differences between the various test Standards used in risk assessment methodology are provided. Results from a recently-tested surface-mounted reinforced concrete VSB with an integrated security fencing is discussed. The VSB was conceptualised from a preliminary momentum-based design approach to derive a preliminary barrier, and then modified accordingly to fit the specification.