The influence of technical conditions and the age structure of vehicles on traffic emission

The article presents the results of the simulation of the traffic emission from vehicles for different type of roads. The calculations of emission have been made by using the methodology which is used in Europe. To register the number and the type of vehicles for each road a digital camera was used. The traffic stream has been recorded in the same length of time. The investigations have been made for different classes of roads with different types of vehicles. There was estimated number of the vehicles per vehicle category and the agę structure of the vehicles for each type of road. The vehicles have been divided into different exhaust emission legislation classes. Additionally, measurements of the group of 300 different vehicie have been made. Those measurements provided information about the level of emission from each vehicle. The total vehicle emission was calculated depending on the type of road, the number of vehicles, the number of vehicles per vehicle category, the age structures, the average speed per vehicle type etc. At first, the simulation of the traffic emission from vehicles was made, taking into consideration the fact, that the vehicles are in good technical conditions. Next, the calculation was made for real technical conditions of vehicles. This investigation has shown that the technical conditions of the vehicles have an important influence on the estimated emission level.