Conventional capacity & delay models of unsignalized intersections are developed on the premise that major street vehicles have higher priority. Recent studies have found that these models might not well reflect the real-world situation, due to the existence of continuous move-up behavior. It has been observed that such behavior does exist in domestic cities. The major purpose of this study is, therefore, to develop more appropriate models, taking into account the effects of move-up operations. Field traffic data are collected and analyzed from five typical intersections in Taipei. A delay model is developed and validated based on these data, and is compared with conventional models. It is concluded that the proposed model may describe the real operational characteristics better while conventional models tend to overestimate the delay of minor street vehicles and underestimate delay of major street vehicles.