Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on: Microscopic modeling of multi-lane highway traffic flow,
  Nathan O. Hodas and Arnand Jagota, Am. J. Phys. 71 (12) 2003, pp. 1247   In heavy traffic with congested roadway the maximum traffic flow also depends
on length of cars. This is deduced in a simple derivation suited for classroom
demonstration as well as homework. The resulting equation demonstrates a new
relation to an apparently unrelated area of physics, the maximum ship velocity
(hull speed) and explains why traffic is sometimes faster on the slow lane on a
congested multi-lane road.

11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th