Evidence of low-dimensional dynamics in a traffic noise time series

The noise level measurements were made at 10 s interval near a busy road which 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 that 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.