Uncontrolled nodes

For uncontrolled nodes, the impedance of a turn is determined from a node VD function and the turn penalty (t0-PrTSys of the turn). The node VD function takes into account the node volume (= sum of the turn volumes), the node capacity, and t0 of the node, i.e. exactly as in the calculation model node VD function (Node impedance of nodes VD function)

The impedance calculated from the node VD function can optionally be limited to a maximum value. Here, the turn time at the node (node attribute t0 PrT) enters via the node VD function under any weak closure. The turn penalty is added only after the maximum value has been determined.

The Visum attributes listed in Table 99 are considered for calculation.

Table 99: Attributes for calculation of uncontrolled nodes

Network object	Attribute	Description / Effect
Node	Capacity PrT	The total capacity of the node in PCUs
Node	t0 PrT	Turn time at the node in the unloaded network
Turn	t0_PrTSys	Turn penalty