The noise level measurements were made at 10 s interval near a busy road wh
ich admits one-way traffic only. The time series thus obtained was analysed
using non-linear dynamical techniques. The results of the analysis suggest
that the underlying dynamical process could be deterministic. It appears t
hat the data support periodic and quasiperiodic attractors. The presence of
colour fluctuations in the time series could be attributed to shuttling of
the dynamics between these two attractors. (C) 2001 Elsevier Science Ltd.
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