FSUTMS Comprehensive Modeling Workshop - Cambridge ...

Overview – Equilibrium Assignment
►Equilibrium, in transportation assignments, occurs
when no trip can be made by an alternate path
without increasing the total travel time of all trips in
the network.
►Equilibrium assignments are considered multipath
because the final loads are a linear combination of
the all-or
or-nothing loads of each iteration and the
fact that each load may be assigned to a different
path due to the assignment of time after each
iteration.
FSUTMS--CUBE MODELING TRAINING SERIES
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Overview – Equilibrium Assignment Process
►A series of iterative all-or
or-nothing assignments.
►Adjustment of travel times reflecting delays
encountered in the associated iteration.
►Combining loads with previous loads to
minimize the impedance of each trip.
►Pre-loading
is used for trip types that are
considered not sensitive to congestion (such as
truck trips and external-external trips).
FSUTMS--CUBE MODELING TRAINING SERIES
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9-3