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What is INFATI?
- Road Safety
- Different Technologies
- Other ISA-projects
- INFATI and big brother
The INFATI Project
Organisation
Contact
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Different
Technologies
There are different options with regard to choice of
speed support systems. Basically it is necessary to have to systems. The
one system must compare the vehicle geographical position and the
relevant speed-limit. One way to solve this problem is to use
transmitters at the roadside. An other method is to use GPS and digital
maps. The other system must inform the driver whether the local speed
limited is being observed. To this end, there exist various information
systems and a "active gas pedal".
Information
The system can consist of a box with 2 lamps or diodes and a sound
signal. In case the driver observes the speed limit, a green lamp/diode
is on.
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If the driver
exceeds the speed limit, a red lamp/diode is on instead, and
there will be a voice which announce the speed-limit that you
are driving to fast; e.g. "50 - you are driving to
fast". The system can be combined with a display which
shows local speed limit.
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Click here
to hear the INFATI sound This
technique is tested in the INFATI project
Speed monitoring
A variant of the system can be used for speed monitoring. The basic principle is that all violations of the speed limits are registered in a car computer. The system can be constructed so that a violation only is registered if the driver ignores several warnings.
This technique is testet in Borlänge.
Active Gas Pedal
By using counter-pressure, the active speeder pedal can tell the
driver that the vehicle has reached the speed limit. One of the
advantages of this system is that the driver doesn't have to take the
eyes away from the road. The driver won't notice the active speeder
pedal until the vehicle reaches the speed limit. If the driver tries to
exceed the speed limit, there will be a counter-pressure in the gas
pedal, which can be described as a brick under the gas pedal. However
the system has a kick-down function, i.e. the driver can disconnect the
system by pressing a little harder on the gas pedal, if it is necessary
in a specific situation. This technique is developed by IMITA
and is tested in Lund
and Lidköbing.
Transmitters at the roadside
Transmitters at the roadside can send the local speed limit to the
passing cars. The transmitters can be used on stretches and in areas
where the speed limit is different from the "normal" speed
limit. For example country roads where the speed limit is changed from
80 km/h to 70 km/h, or in urban areas where the speed limit is changed
from 50 km/h to 30 km/h.
This technique is testet in Umeå.
GPS and digital maps
Global Positioning (GPS) is a satellite based system. By means of a
GPS receiver, the vehicle can establish its position. It is a one way
signal, i.e. the GPS receiver doesn't send any signals, and therefore
information about the vehicle's positions remains secret. An important
part of the system is the digital map which contains the local speed
limits. When the GPS receiver has established the position of the
vehicle, the system reads the local speed limit from the digital map.
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