A New VDF Formula: A faster process for doing UE assignments has been the subject of several recent TMIP postings. A User Equilibrium (UE) assignment is of course a Nash Equilibrium in which the paths are chosen such that the impedance (e.g. Vehicle Hours of Travel) of every user between any OD pair is at equilibrium. The issue is that the impedance on each link is not known until after equilibrium is achieved. Because the impedance function uses the equilibrium… https://tmip.zephyrtransport.org/scripts/wa-ZEPHYRTRANS.exe?A2=TMIP%3B52f88010.2404&utm_source=dlvr.it #tmip