3
Release 07/22
Roadside Safety Barrier
3.0 Crash Test Analysis
Crash test guidelines provide a minimum set of
requirements that a roadside barrier has to meet in order
to demonstrate its satisfactory impact performance.
Whilst crash test guidelines cannot include all possible
impact conditions that may be experienced in the real
world, the crash test matrix is selected to represent a “worst
practical condition” for a roadside barrier impact.
Ezy-Guard Smart has been fully crash tested and evaluated
according to the specifications for Test Level 3 (TL3) of the
AASHTO Manual for Assessing Safety Hardware (MASH).
The MASH specification is an update to and supersedes
NCHRP Report 350 for the purposes of evaluating new
safety hardware devices.
The MASH TL3 crash test matrix requires the following
impacts;
•
1100kg car travelling at 100km/h and 25 degrees.
•
2270kg pick-up travelling at 100km/h and 25 degrees.
Crash test impact conditions are defined by the mass,
speed, and angle of the impacting vehicle. Crash test
standards and performance levels can be compared by
calculating the impact severity (IS).
IS = ½ M (V sin θ)2
Where IS is the impact severity in joules (J), M is the test
inertial mass of the vehicle in kilograms (kg), V is the
impact speed in metres/second (m/s) and θ is the impact
angle in degrees.
Wire Rope Barriers
Accepted within
Australia
100
156.4
2,000kg
pick-up truck
travelling at
100km/h and
25 degrees
8,000kg
truck travelling
at 80km/h and
15 degrees
2,270kg
pick-up truck
travelling at
100km/h and
25 degrees
137.8
132.3
125
150
175
NCHRP
350
TL
4
NCHRP
350
TL
3
MASH TL
3
Note: The MASH TL4 impact severity is 209.3kJ
Figure 1: Comparison of Crash Test Impact Severities
Crash Test Performance Level
Impact
Severity
(kj)
Ezy-Guard Smart
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