The attribute value can also be computed using a formula or determined based on a distribution defined within Vissim. If the attribute value is derived from calculated attribute values using a formula, Vissim utilizes the attribute values that arise after the pedestrians have completed their movement on the network object.

Successive attribute decisions in a time step take into account the changes resulting from the previous attribute decisions in the same time step. This principle applies to successive attribute decisions that impact a pedestrian. This pedestrian is not influenced by changes to attribute values resulting from attribute decisions made by other pedestrians in the same time step.

Vissim considers an attribute decision on a ramp if the pedestrian utilizes the ramp to follow their pedestrian route. However, if the pedestrian only briefly enters the ramp and their pedestrian route does not traverse this ramp, the attribute decision is not taken into account.

A passenger alighting from a public transport vehicle only makes an attribute decision in the time step during which they reach the platform edge. Until then, the public transport vehicle is assigned to the pedestrian as a design element.

You can transfer the set attribute value to a pedestrian route. This allows you to select a route based on the attribute value (Modeling pedestrian routing decisions, pedestrian routes and partial pedestrian routes). You can restrict the attribute value to the required pedestrian classes.