Abstract
Density fluctuations in traffic current are studied by computer simulations using the deterministic coupled map lattice model on a closed single-lane circuit. By calculating the power spectral density of temporal density fluctuations at a local section, we find that it exhibits a power law, being proportional to 1/ f 1.8 where f is the frequency, in the noncongested flow phase. The distribution of the headway distance h also follows a power law, being proportional to 1/ h 3.0 . The power-law fluctuations are destroyed by the occurrence of a traffic jam.
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