This study assessed the trip generation model based on the ordered logit model to analyze the trip generation characteristics for three types of construction vehicles. The assessment indicated that the trip generation characteristics of these vehicles vary between the various operating areas of different types of vehicles. They also differ in terms of the major freight items they transport and the areas in which they operate. These differences, and others not listed here, indicate that construction vehicles and machinery should be divided into separate categories instead of being considered a single entity when developing a policy to reduce the emission of pollutants from the transportation sector. Obviously, vehicles that are operated in non-metropolitan areas must cover a larger area than vehicles that are operated exclusively in metropolitan areas. This distinction requires us to consider the main operating areas in addition to the characteristics of different vehicles when estimating basic data for the vehicles, such as the amount of emissions associated with the distance the vehicles travel.

[Key Words]: Three Different Types of Construction Vehicles, Pollutant, Emission, Trip Generation Characteristics, Ordered Logit Model