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Subject:

Hetrogeniety and Chaoes

From:

Sonal Ahuja <[log in to unmask]>

Reply-To:

Sonal Ahuja <[log in to unmask]>

Date:

Fri, 22 Jun 2001 12:44:00 +0100

Content-Type:

text/plain

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text/plain (66 lines)

On Thu, 21 Jun 2001, Paul Rosen wrote:

> > In addition i also wondered if any members of the list had come across any
> > literature concerning the application of chaos theory to traffic flows and
> > traffic congestion
>
> I haven't, but I'd be very interesting to see any replies sent to the
> list rather than privately - would a chaos theory analysis challenge or
> reinforce conventional traffic modelling/planning wisdom?

Dear Paul/ Friends,

Last year, during my research at University of Newcastle we tried simulating
heterogeneous and untidy traffic.
To me the traffic in heterogeneous and untidy conditions is more chaotic
than any other driving condition.

We investigated the driver behaviour in a mixed traffic flow environment and
concentrated on simulating traffic in Delhi, Dhaka and Bangkok. It looked
into the relationship of varying driver topologies, based on age, sex, trip
time and purpose and relative aggressive levels associated with trips in the
three case locations based on their vehicle topologies.

One of the finding of the study was that while heterogeneous and mixed
traffic increases vehicle delays, and stops at the signalised links, untidy,
traffic reduces it. The combined effect of heterogeneity and untidiness
cancel each other.

This is a key result that portrays an example of undesirable or un-optimised
system being forced to Harmony due to Chaos. The heterogeneity in traffic
leads to "negative" system performance or the system functioning less than
its efficiency. And Untidy traffic due to poor lane discipline seemed to
benefit the system performance. In totality the traffic systems in all case
study areas seemed to be running in a self derived equilibrium that was
perhaps best suited for that environment. It was also found out that the
level of driver aggression in an environment is a function of, level of
level of heterogeneity. Another interesting finding was that as congestion
level increases, untidiness in the traffic reduces, as the drivers are
forced to move in an "orderly situation" (best described in the case study
of Bangkok traffic").

All these findings could well consolidate the fact that even though chaotic
systems might not be desirable, they can lead to equilibrium and system
optimisation under the defined set of rules.

Ahuja S. (2000), Simulation of Heterogeneous Untidy Traffic at Signalised
Links in Developing countries, University of Newcastle upon Tyne, Newcastle.
Bell M. G. H., Iida Y., (1997), Transport Network Analysis, Wiley, Sussex.

Sonal Ahuja




Sonal Ahuja
Email: [log in to unmask]

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