City and countryside tunnels preserve unique locations and minimise travel time by avoiding intersections with other infrastructure. Nevertheless, to guarantee a smooth and safe traffic flow through tunnels, many requirements have to be met. Technology plays an essential role in this.

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IMTECH TRAFFIC & INFRA

2. Comfortable and Sustainable Environment
Urban areas are growing; with the result that more people have less
space to live, to work and for recreation. This also means that traffic
in and between cities is growing as well, creating a threat that parks
or landscapes will have to be sacrificed. Road and rail tunnels are the
pragmatic solution to retain a liveable and sustainable environment
for everybody and to improve travel comfort.
Smooth Traffic Flow
City and countryside tunnels preserve unique locations and mini-
mise travel time by avoiding intersections with other infrastructure.
Nevertheless, to guarantee a smooth and safe traffic flow through
tunnels, many requirements have to be met. Technology plays an
essential role in this.
Tunnel Safety
Accidents in tunnels can have catastrophic consequences. Therefore
it is necessary that safety and incident management is included
at the design stage and is continued in the building and operating
phase. Traffic and tunnel technical installations are crucial to pre-
vent and detect accidents and protect the tunnel, its users and the
environment from a disaster.
High Availability
Both the volume of traffic through and the length of tunnels are
growing. Combined with higher international safety standards and
an increasing number of technological installations, it is difficult for
operating personnel to have a complete overview of the situation in
the tunnel and its surrounding area. Only with a totally integrated
solution that combines information and control, of the entire tunnel
and the traffic network, can the highest availability be achieved.

3. The Integrated Tunnel Disciplines of Imtech
Electrical
Almost all installations in tunnels are dependent on electricity to work properly. A continuous and
stable power supply is therefore crucial for the safety and availability of a tunnel. We have design
engineering, installation and maintenance experience, ranging from high-voltage switchgears to
medium and low voltage distributions boards. A totally integrated energy management system with
additional uninterruptable power supplies and power generators guarantees the continuation of
electrical energy, even when the mains electricity supply has failed. With the use of a tunnel lighting
management system and LED technology the safety and availability of tunnels is increased while
reducing electricity demand.
Mechanical
The ventilation system is the most visible mechanical installation in tunnels. It is continuously being
used to extract toxic and hot exhaust fumes. The air pollution in a tunnel is measured using sensors
lined to the ventilation system. Fans are also used in case of fire to remove smoke and heat quickly
and completely, making it possible for road users to safely exit the tunnel. Other mechanical instal-
lations like emergency exits, fire extinguish and pump installations are also vital for the safety of
the tunnel, its users and the environment. Typical for all mechanical installations is that they have to
be designed and built in close cooperation with the civil constructor and are maintenance sensitive.
Traffic
To be sure that traffic can safely and smoothly drive through tunnels, preventative and corrective
solutions are available. On the ramp to the tunnel a height detection system is installed to prevent
vehicles that exceed height limits from accessing the tunnel. Inside the tunnel automatic speed
detection systems are used to detect slow or stopped vehicles. In the case of a traffic jam or an
accident, approaching traffic is ordered to slow down by the motorway traffic management system.
With the traffic signalling system, lanes can be closed to traffic and vehicles can be forced to move
to another lane. Together with the other Electrical and Mechanical installations these traffic instal-
lations provide a secured and regular flow through the tunnel.
ICT
All information comes together in the Control Centre. From here the safety and traffic flow is
monitored continuously by the operators. Video cameras observe the traffic and the situation in the
tunnel and give the operators a complete overview of the situation in case of an incident. Using the
speaker or the radio broadcast system, the operator can give instructions to the people in the tun-
nel or they can have contact via the intercom installation. From the Control Centre, installations can
be controlled manually or emergency services can be alerted to respond to a situation. All technical
installations are connected to the communication network, linking data, voice and video to the
Control Centre.

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Integrated Approach Total Solution Provider
Imtech is your partner for the design, build, main- Imtech is a total solution provider for road and rail
tenance and operation of a safe tunnel offering tunnels. One partner for all solutions and services, gua-
optimal conditions for the users and stakeholders. By ranteeing the lowest total cost of ownership (TCO) and
working in close cooperation with our customers, we the highest safety and availability for your infrastruc-
understand your requirements and translate these ture. Thanks to a multidisciplinary integrated approach
into solutions and services. Through our longstanding for every phase of your tunnel project, we offer the
international experience, manufacturer independency highest added value for all parties involved.
and an integrated multidisciplinary approach, we give
you the best performance to meet the demands in all
phases.

6. Imtech Traffic & Infra
Basicweg 16
3821 BR Amersfoort
P.O. Box 2542
3800 GB Amersfoort
The Netherlands
T +31 (0) 33 454 17 77
F +31 (0) 33 454 19 75
E Info.infra@imtech.nl
I www.imtech.eu/traffic-infra
The total solutions provider www.imtech.eu/traffic-infra