GATE 2021 AR – Question 23

Urban Land Use and Transportation · Aggregate and disaggregate transport demand models and forecasting · 1 mark · Multiple choice

In congested-network assignment, all used routes between an OD pair have equal travel time, no greater than an unused route. What is this condition?

System equilibrium
All-or-nothing
User equilibrium
Incremental

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Show answer and explanation

Correct answer: (C) User equilibrium

Explanation

This is Wardrop’s user-equilibrium condition: no individual traveller can reduce journey time by unilaterally changing route. Thus C. System optimisation minimises aggregate cost and need not equalise individual route times in the same way.

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