There is a general misconception in the industry that a vehicle is rated according to the generally accepted ballistic standards. This is NOT the case. There is no formal standard currently existing which applies to armored vehicles construction. Ballistic standards are a material specification only.
Any material which can defeat the ballistic requirement will be compliant and can be certified as meeting that standard.  It is true that the vehicle manufacturers must use independently certified materials in construction of the vehicles, but it is HOW they do this that is the important factor. All vehicle manufacturers designs are not the same and the designs vary from company to company. Vehicle cost will also vary depending on the design that is used.
Find here the best Manufactorys for Bulletpoof Cars, Armored Cars

Personal security is especially important in times as these with terrorist attacks everywhere. Not only politicians and VIPs protect themselves with armoured vehicles, but also private individuals in senior positions and that work for specific companies. In these cases personal safety within the vehicle is especially important,as theses are often consided 'soft targets' by attackers. By using the correct construction and armouring the risk can be reduced to a minimum.
Most armoured vehicles nowadays don't obviously look armoured, but they offer the highest possible sense of security for the owner.