Congestion is the condition when the hourly traffic demand exceeds the maximum
sustainable hourly throughout of the link. The aim of this research is to estimate the congestion
cost of private passenger car users in central business district along the corridor of Malioboro,
Yogyakarta, Indonesia. The amount of the congestion cost is the difference between perceived
and actual generalized cost in traffic jam condition. In this paper, only the congestion costs of
private passenger car users are estimated, as they are expected to shift to buses. The generalized
costs from origin zone i to destination zone j consist of vehicle operating cost, travel time cost, and
pollution cost. This study shows that while the perceived generalized cost for private cars at
Central Business District (CBD) Malioboro is IDR 3101.00 per trip, the actual generalized cost in
traffic jam condition is IDR 5802.00 per trip, giving the estimation of congestion cost in CBD
Malioboro for private passenger car users as IDR 2701.00 per trip.