Technology Profile |
The advantages of
monitoring heavy vehicles
Weigh-In-Motion (WIM)
systems are vital for
managing overloaded
vehicles on roads. Such vehicles
can affect the life expectancy of
road infrastructures, increase
the degradation of pavement,
bridges and viaducts, impact
road safety and increase
environmental pollution. Many
public mobility agencies, public
road administrators and road
concessionaires are interested
in reliable gross and axle weight
data to sustainably manage the
use of their roadways.
Using WIM, it is also possible
to regulate unfair competition
between transportation
companies, by detecting and
penalising overloaded vehicles
in a more efficient way that
avoids static scales on the
roadside, an approach that
is both time consuming and
of limited capacity. Other
applications of WIM systems
include: tolling by weight,
logistic site implementations to
check the weight on entry and
exit, and automatic invoicing.
WIM systems can measure
the weight of vehicles at normal
transit speed, without any
traffic flow disturbances, thus
eliminating the problem of long
queuing at static weigh stations,
whose use will be limited, when
required by legislation, to
vehicles pre-selected by the
WIM system.
ITS influences
WIM is having a significant
impact on Intelligent
Transportation Systems
(ITS), particularly when fully
integrated with other road
infrastructure monitoring
equipment such as video
surveillance, IoT (Internet of
Things) sensors for structural
health monitoring and traffic
management systems to
streamline roadway
| Need to know
Libra/S by Sinelec is able
to collect system-wide
data for a global view of
the WIM network
080 Traffic Technology International January/February 2020
www.TrafficTechnologyToday.com
> Interfaces with
Operational Control
Centres
> Open to the integration of
existing WIM
> Designed to simplify
management operations
management operations.
WIM measures the dynamic
tyre force of a moving vehicle
then calculates the
corresponding static values in
terms of gross vehicle weight,
axle load, axle group load and
wheel load.
They typically consist of
roadway sensors that detect the
passage of the vehicle, and a data
logger needed to process, sort,
analyse, and transmit the
recorded data.
The quality of the calculation
is dependent on the quality of
the site and installation, the
technology of the sensors
and the site design. Site design
Left: Libra/S
monitors a site
while collecting
system-wide data
Acting as an integrated
solution based on field and
central station elements, Libra/S
is open to the integration of
existing and third-party WIM
solutions. It also interfaces with
Operational Control Centres
(OCC) via the most common
communication protocols.
Through its diagnostic, dataanalysis
and reporting tools
Libra/S is able to constantly
monitor the components of a
single site while collecting
system-wide statistical data
for a high-level global view of
the network of WIM stations.
The central level of Libra/S
consists of a back-end for the
management of multi-brand
field devices and a web
interface, designed to simplify
management operations and
enable remote monitoring,
diagnostics and the collection
of weight and traffic data.
Mobile access optimises
the usability of the system,
allowing immediate control
actions for enforcement and
maintenance purposes.
WIM systems are a valuable
enabling tool for data-driven
models and for the
implementation of proactive
decision support systems,
applicable in the areas of
infrastructure management,
logistics and the access
management of ports and
intermodal terminals.
elements include site selection,
the number and configuration
of the sensors, the interface,
and the associated software.
The selection of an appropriate
site significantly impacts the
accuracy and lifetime of the
weighing sensors. In addition,
the WIM system provides date
and time of passage, speed, class,
length and wheel base,
performing as a sophisticated
traffic monitoring tool.
The monitoring of heavy
vehicles enables detailed
information about their transit
to be collected. This data, when
analysed at a central level, can
generate reports and graphical
representations of the traffic.
This can be used to identify the
traffic flows and O/D (original
destination) matrices, helping
the customer optimise the dayto
day roadway management
as well as the development of
predictive maintenance models.
Experience benefits
Libra/S is a WIM solution, based
on Sinelec’s ITS know-how and
experience gained working as
the technology company of the
ASTM Group, the second largest
toll road operator in the world
with over 4,500km of roadway
in concession.
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