The objective of this study is to investigate theoretically and empirically transfer effects to public transit by regulatory and incentive systems such as the increase of fuel price and parking fee, and the subsidy of public transit commuting cost. Also, total group is divided into several sub-groups, considering various variables relating to individual, social, commuting, and vehicle characteristics to affect the choice of commuting modes. As empirical results, all the models was significantly estimated, and the homogeneity of estimated coefficients among sub-groups was rejected at the five percent significance level, exclusive of vehicle tenure period variable. And, empirical result with total group shows that transfer effect by the subsidy of public transit commuting cost ranks highest, followed by the increase of fuel price, the increase of parking fee. And, the status quo public transit share is higher as respondent is man, younger, age is lower, income is higher, and commuting time is shorter, etc. In addition, empirical results with sub-groups show that transfer effect by the subsidy of public transit commuting cost is highest, except for non-business use and high income sub-group. Especially, the subsidy of public transit commuting cost is very effective in sub-group with higher age, business user and LPG fuel user, etc.

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