Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chaotic semi-express buses in a loop   Urban mobility involves many interacting components: buses, cars, commuters,
pedestrians, trains etc., making it a very complex system to study. Even a bus
system responsible for delivering commuters from their origins to their
destinations in a loop service already exhibits very complicated dynamics.
Here, we investigate the dynamics of a simplified version of such a bus loop
system consisting of two buses serving three bus stops. Specifically, we
consider a configuration of one bus operating as a normal bus which picks up
passengers from bus stops $A$ and $B$, and then delivers them to bus stop $C$,
whilst the second bus acts as an express bus which picks up passengers only
from bus stop $B$ and then delivers them to bus stop $C$. The two buses are
like asymmetric agents coupled to bus stop $B$ as they interact via picking up
passengers from this common bus stop. Intriguingly, this \emph{semi-express}
bus configuration is more efficient and has a lower average waiting time for
buses, compared to a configuration of two normal buses or a configuration of
two express buses. We reckon the efficiency arises from the chaotic dynamics
exhibited in the semi-express system, where the tendency towards anti-bunching
is greater than that towards bunching, in contradistinction to the regular
bunching behavior of two normal buses or the independent periodic behaviour of
two non-interacting express buses.

27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys