Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Number fluctuations induce persistent congestion   The capacity of a street segment quantifies the maximal density of vehicles
before congestion arises. Here we show in a simple mathematical model that
fluctuations in the instantaneous number of vehicles entering a street segment
are sufficient to induce persistent congestion. Congestion emerges even if the
average flow is below the segment's capacity where congestion is absent without
fluctuations. We explain how this fluctuation-induced congestion emerges due to
a self-amplifying reduction of the average vehicle velocities.

23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc