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Indonesian Highway Capacity Manual (IHCM) is used as a guideline for calculating delays and queues at unsignalized intersections. Since it was published in 1997, there has never been an update on IHCM. The aim of this study is to improve the IHCM formula to calculate the delay and queuing in unsignalized intersections. Traffic data on 8 cities in Indonesia has been collected, then a delay and a queue calculate using the IHCM formula. The results of the assessment are based on calculating using IHCM formula, delay values and queues are different from field values. The high level of mayor road traffic flow (> 3000 vehicles / hour) and minor (> 800 vehicles / hour), as well as the right and left turn ratio (> 10%) is one of the reasons that the calculation in IHCM becomes inappropriate. Furthermore, by comparing the results of calculations with the results of the field, it appears that motorcycles determine the composition of vehicles at the intersection, so it has been improved the value of passenger car equivalent for motorcycles. In addition, it was also approved to improve the value of base capacity for unsignalized intersection.