The 'Wardrop''s equilibrium' condition in traffic assignment states:
Choose the correct answer
All vehicles must travel at equal speed
At equilibrium (UE), no driver can reduce travel time by switching routes — all used routes have equal minimum time
System travel time is always maximised
Only one route used between any O-D pair
Correct Answer
B. At equilibrium (UE), no driver can reduce travel time by switching routes — all used routes have equal minimum time
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Wardrop''s 1st principle (User Equilibrium, UE): In equilibrium, NO traveller can unilaterally reduce travel time by changing routes — all used routes have equal (minimum) travel time; unused routes have ≥ travel time. 2nd principle (System Optimum, SO): routes chosen to minimise total system travel time. UE is realistic (self-interested behaviour); SO requires coordination.
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