With the new SOLA and PToll traffic assignment procedures in Emme, there is even more choice for Emme users to select the best traffic assignment for their model applications. Curious how to choose the right one? Here we summarize some criteria which may be helpful in picking the best traffic assignment for the job.

Meet the candidates. Traffic assignment algorithms at Emme 4.1:

• Standard traffic assignment. Based on a multithreaded linear approximation method.
• Path-based traffic assignment. Based on a projected-gradient method.
• SOLA (Second Order Linear Approximation) traffic assignment. Based on a multithreaded conjugate/bi-conjugate variant of the linear approximation method.
• PToll traffic assignment. Based on the SOLA traffic assignment but with special consideration for tolling applications.

A note to the reader that the discussion below refers specifically to the Emme design and implementation of these procedures. Conclusions may or may not be transferable to other implementations, despite any similarities in naming. Also, this discussion concerns static traffic assignment. For dynamic traffic assignment see Dynameq.

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