Has your car driven you home lately?
ever-growing number of cars on our roads creates numerous
traffic-related problems for society. Fortunately, technology is coming
to the rescue and Wi-Fi based wireless mesh networks are a crucial
piece of the equasion.
is a huge concern. The need to keep traffic flowing more smoothly not
only contributes to greater energy efficiency and cuts down on
pollution, but more importantly, improves road safety.
Lan with "mesh" intelligence is an important innovation that can
improve safety on the highways and save human lives.
vehicles can communicate directly with one another and over hundreds or
thousands of feet to a wireless node. In the above picture, the white
car coordinates an overtaking maneuver with the three vehicles in the
right-hand lane (above). The braking signal of the white car is
automatically transmitted to the red car, despite the fact that his
view is obstructed by two trucks (below).
equiped with the appropriate gear will gather traffic-related data like
speed, location, and direction of travel, weather conditions and
related vehicle information, such as windshield-wiper and headlight
use, outside temperature, and traction-control-system data. which can be stored locally in the vehicle
and sent in real-time over the wireless mesh network to a central
data will be wirelessly transmitted to the state Condition Acquisition
Reporting System (CARS) where analysts can use the information to
create weather and traffic advisories. The advisories can then be
available on highway message signs, via special phone numbers and web
In addition to on-board Wi-Fi,
some dealers and auto manufactures optionally offer built-in GPS which
collects data, weather and road condition info. With the use of these
sensors, the department of transportation may choose to deploy
municipal resources as needed. For example, the dispatching of
emergency-response teams or road-side maintenance crews.
While this is still a
work-in-progress, the department of transportation is taking advantage
of all reasonable means to prevent crashes and reduce the deaths on our
highways with the goal of treating roads as an extension of vehicles,
using both design and technology to help prevent crashes and make
Today's high-tech new vehicles have up
to 200 sensors that measure everything from engine processes to outside
air temperature. "Intelligent vehicle" advocates seek to capitalize on
that information and use it to more efficiently and safely manage
transportation systems. and the U.S. Federal Highway Administration
(FHA) is exploring vehicle-to-roadside and vehicle-to-vehicle
application of wireless mesh networks is ideal for automatic proximity
cruise control, forward collision warnings, and collision avoidance
warnings at intersections. In addition, the system could also warn
drivers about approaching emergency vehicles.
network is suitable for communication between a vehicle and
infrastructure facilities. A mobile transmitter could warn about a
construction site just around the curve (left). An emergency service
vehicle could switch its own traffic light to green, while ensuring
that ohter intersection users see a red light (right).
how far can you go with this type of capability? U.S. Federal Aviation
Administration uses this type of information to give directions to
pilots to avoid possible threats. For automobiles, accidents could be
avoided with intelligent accident avoidance system. Cars could detect
other vehicles not heeding a red light. If a car slips on ice,
intelligent systems could not only inform other drivers but send a
notice through the receivers alongside the highways to road crews that
salt or sand is needed. Such systems could even be programmed to stop
cars before an accident occurs — without driver involvement. It's would
even be possible to remotely monitor someones health condition before
and/or after an accident.
The need for intelligent vehicles is
real. The U.S. National Highway Traffic Safety Administration estimates
that driver error or inattention caused 20 to 30 percent of the 6.3
million accidents reported in 2000. Most are preventable and the
personal cost is high with over 40,000 deaths are reported per year,
with millions more injured. Costs to the U.S. economy are estimated at
200 to 300 billion dollars.
this application scenario, a vehicle could automatically transmit its
individual performance data to a service center for diagnosis. If
necessary, the service center could then advise the driver to proceed
to a workshop, or even transmit updated software for engine adjustment
or the electronic stability program.
this wireless radio signals to a conversion station, the nodes transfer
can transfer the data over multiple miles to other wireless nodes while
performing fast-roaming with sub-second latency handoffs ehich means
that communication continues, unbroken. That way vehicle data can be
transmitted to a service center for a remote diagnosis (left), tourist
information and tips could be received (right).
achieve Vehicle-to-vehicle communication, auto manufactures must make
efforts to include WiFi and related technologies into automobiles while
roadways are deployed with wireless mesh network equipment that can
provide the sustained throughput and low latencies required to handle
thousands of transactions per second with vehicles moving at speeds up
to 80 MPH or exceeding.