This is what an unauthorized truck would look like if it tried to enter your facility when protected by a Delta barricade. 

That's why companies such as Chevron, ExxonMobile, Conoco, BP, Shell and others employ Delta barricades, bollards and crash gates to protect their petrochemical and hydrocarbon refineries, facilities, distribution centers and storage areas. Vehicles not authorized can't get through. Period.

These barriers will stop and destroy a truck weighing up to 30,000 pounds and traveling at 50 mph. They can be raised or lowered at will to stop traffic or let it through. In an emergency, the thick steel plates pop out of the ground within 1.5 seconds.
When integrated properly into a total system, including fences, lights, alarms, gates, and other security components, vehicle barriers are a key measure in preventing threats to sensitive resources.

Protecting your perimeters is no small responsibility. Knowing you've got the right equipment in place to secure the facility and to prevent human tragedy brings a peace of mind that no amount of money can buy. Carefully researching available options and consulting with experts will ultimately lead to the right solution.