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Smart VMS technology that meets
the highest international standards
| Need to know
Seewor’s VMS
technology compliance
with EN12966 standard
Traffic Technology International January/February 2020
www.TrafficTechnologyToday.c 070 om
• Wind-loads: WL0-WL9
• Dynamic snow loads: DSL0-
DSL4
• Temporary deflection by
bending: TDB0-TDB6.
Compare and contrast
With EN12966 standard, VMS
users can easily compare the
performance on the certificate
and test reports. Shenzhen
Seewor Technology, developed
the test module after a series of
experiments proving it fully
complies with the EN12966
EN12966 is the most
authoritative standard for
vertical road traffic Variable
Message Signs (VMS), installed
permanently for the instruction
and guidance of road users on
public and private land.
VMS variations
In the European market, there
are many types of VMS with
different technologies, designs
and sizes.
It is necessary and important
to standardise for road
authorities and road safety
project personnel who may
use VMS. However, because
of complexity, the EN12966
standard does not define
specific VMS, but is based on
a test-module consisting of the
same materials, devices and
properties.
VMS manufacturers have to
prove by ITT (initial type testing)
that the test module fulfils the
demand of the required optical
performance classes.
> Static driving modes in
the selected IC and PCB
design are adopted to
ensure the frequency
is higher than 90Hz
> When the light sources
of a test module are
operating in a pulse mode,
no light flicker is visible.
This guarantees the
optical performance and
compliance
> LED failure monitoring
• Vibration resistance
• Corrosion resistance
• EMC
• Uniformity of visual
performance
• Visible flicker
The Following performances are
given by classes:
• Color: C1,C2
• Luminance: L1, L2, L3,
• Luminance ratio: R1, R2, R3
• Beam width: B1-B7
• Temperature: T1, T2, T3
• Protection: P1(IP44), P2(IP54),
P3(IP56)
The confirmation of
compliance is issued by a notified
body selected and authorized by
national authorities such as the
ministry for transport.
Areas for testing
The ITT has four aspects of
testing for dangerous substance,
visual performance, mechanical
characteristics and durability.
The following performances
are pass/fail:
• Electrical performance
• Impact resistance
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