https://en.wikipedia.org/wiki/Traffic_simulation#Software_programs
名词解释
System State：
a set of variables that contains enough information to describe the evolution of the system over time.
System state can be either discrete or continuous. Traffic simulation models are classified according to discrete and continuous time, state, and space.
Sokolowski, J. A., & Banks, C. M. (2009). Principles of modeling and simulation: A multidisciplinary approach. Hoboken, N.J.: John Wiley.
Jorge Laval, Ph.D, Assistant Professor, Georgia Tech, Lecture Notes on Traffic Simulation
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