2. Traffic, Congestion and Some Solutions
• We are here to discuss data issues – but traffic
and congestion have already been dealt with!
• What do I mean?!
• These terms come from the transportation
world so let’s look at what happened there.
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3. The First Car
• The first automobile patent in the US was
granted in 1789
• Karl Benz created the first internal combustion
engine automobile in 1885
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4. New Cars
• Since 1885, Benz’s company has improved cars
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6. Cars and Traffic
• The world's first automobile accident occurred
in Ohio City, Ohio in 1891.
• 25 February 1899 UK – The first fatal collision
accident.
• When automobiles, trucks, and buses came
into widespread use during the first two
decades of the 20th century, head-on
collisions became more common.
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7. Solutions ?
• The United States was home to the first oneway rotary system in the world (implemented
around New York City's Columbus Circle in
1904)
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9. Solutions
• Lane marks were invented in 1911 or 1917
• Do they work?
– The world's first designated bus lane was created
in Chicago in 1940.
– After enforcement Average bus journeys times
dropped, in some cases, by up to 19 per cent.
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10. A Quote from Seattle, 2008
“For years, our commute off the plateau to
school each weekday morning used to be 25
long minutes. Occasionally it was even worse
than that.
But now it's down to 10 minutes. How did this
amazing achievement occur?
More lanes”
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12. Some Facts About TCP
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1968/69: Dawn of the Internet
1978: TCP and IP split into TCP/IP
1983: January 1, ARPAnet switches to TCP/IP
1986: First Internet Congestion Collapse
1987-8: Van Jacobson fixes TCP, publishes
seminal paper "Congestion Avoidance and
Control"
• 1990: Fast recovery and fast retransmit added
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13. And Yet
• Congestion is probably the most popular word
to describe data traffic in today’s mobile
networks
• Why not adopt the transportation solution?
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