(a) L 3.0 Vehicle and cargo are to be stopped
although vehicle partial penetration and/or barrier
deflection of up to 1 m (3 feet) permitted.
(b) L 2.0 Vehicle and cargo are to be stopped
although vehicle partial penetration and/or barrier
deflection of up to 6 m (20 feet) is permitted.
(c) L 1.0 Vehicle is disabled and does not travel
more than 15 m (50 feet) after impact.
2. Prior to 2001, the Department of the Navy had
its own test standard for Vehicle-Crash-Resistant
Barrier Requirements. Since then, the Navy has
discontinued referencing its standard and now
references the DOS specification for certified
vehicle barriers. This guide specification still
recognizes barriers originally certified under the
Navy standard. These barriers are identified as
such in their respective paragraph of PART 2
PRODUCTS. The Department of the Navy publication
Operational Requirement No. 098-09-88: Operational
Requirements for Secure Structures Ashore (Locks and
Barriers, 1986) in which:
Vehicle-Crash-Resistant Barrier Requirements are:
Security
Vehicle
Impact
Kinetic
Level
Weight
Speed
Energy
HIGH
4,535
kg
80
km/h
1133 kJ
(10,000
lb)
(50
mph)
(836,000 ft-lb)
LOW
4,535
kg
24
km/h
102 kJ
(10,000
lb)
(15
mph)
(75,000 ft-lb)
Performance Levels are:
(a) For the high security level, vehicle penetration
from 0 to 3 m (0 to 10 feet) is permitted.
(b) For the low security level, vehicle penetration
from 15 to 30 m (50 to 100 feet) is permitted.
3. Because kinetic energy is a function of the
square of the velocity, the vehicle's speed has more
significance than its weight. Therefore, limiting a
vehicle's speed reduces the kinetic energy the
barrier must resist resulting in a lower barrier
cost. Vehicle barrier requirements are within the
chart combinations below:
SECTION 02840
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