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VN
VN
RSN
Base Station &
server
SMS Gateway
Fig. 11.7
Smart Road Monitoring network architecture
Fig. 11.8
VN and RSN components
regulation signalization and real-time reporting to the authorities. The small-scale
setup is developed with toy vehicles and comprises Sun SPOTs with sensors
placed inside the vehicle, representing the so called vehicle node (VN), a Sun
SPOT roadside node (RSN) receiving the information from the vehicle sensors, a
central server (data center) for gathering information from the RSN, and GSM/
GPRS gateway for sending SMS messages (Fig.
11.7
). Measurable features of
importance for the scenario are the speed of the vehicle (measured with a tachom-
eter placed on a toy wheel [
2
]), distance from other vehicles or objects (distance
sensor placed on a toy front [
3
]), direction of movements (measured with Sun
SPOT's accelerometer), etc.
The initial scenario is applicable in restricted areas such as schools, crossroads,
and one-way roads, where the application is used to notify the drivers whether they
are breaking the defined area rules. The GUI allows monitoring of the vehicles
passing through the area used in the scenario (Fig.
11.8
) and provides a graphical
representation of the vehicle's speed over time.
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