Evaluation of the Impacts of Asphalt Pavement Distress and Road Geometry  on Vehicle Emission: A Case Study on Selected Road Corridors in Addis  Ababa

WODAJO, METI WUDNEH

dc.contributor.author	WODAJO, METI WUDNEH
dc.date.accessioned	2025-04-07T11:21:10Z
dc.date.available	2025-04-07T11:21:10Z
dc.date.issued	2022
dc.identifier.uri	https://repository.ju.edu.et//handle/123456789/9469
dc.language.iso	en	en_US
dc.subject	Pavement Distress	en_US
dc.subject	Road Geometry and Vehicle Emission	en_US
dc.subject	Air pollution is the presence of substances in the atmosphere that harm the health of humans and other living beings. There are different types of air pollutants, such as gases, particulates, and biological molecules. These particles and gases can come from vehicles, truck exhaust, factories, dust, pollen, mould spores, volcanoes, and wildfires. Accordingly, different studies were made to investigate air pollutants' contributions. Hence the pollutants emitted by vehicles cause environmental pollution, and preventive measures were suggested. Some researchers highlighted the exponential increase of the greenhouse gas effect and fuel consumption. The level of concentration from vehicles could be determined by various vehicle and non-vehicle-related factors. However, there are limited research papers that substantiate the influence of pavement distress and geometry on vehicular emissions. Therefore, this paper aims to assess levels of vehicles emission due to pavement distresses and Geometries on Addis Ababa roads. The study used primary for the assessments. The primary data was collected through a manual pavement condition survey with a visual inspection. Road geometries and built road data were collected using total stations. Data on emission was measured using FGA 4000XDS Gas analyser on the purposively selected road sites from three different types of vehicles (Passenger car, pickup, and Two Axel Truck). The data were analysed through descriptive and inferential statistical analysis. The distress observation data shows different distress types. Accordingly, a permanent, longitudinal displacement of a localized pavement area is the most dominating distress type on all three road corridors, followed by rutting and Edge cracks parallel to the outer edge of the pavement distress types on two road corridors. Moreover, the PCI calculation result from one of the road corridors shows that out of the 920m length, 400m is in poor condition, and 100 m is already in the failed state, and in the other lane the 100m at the end is already in a failed range and from 100m-200m is in poor rang. On the second road corridor, 58% is in good condition, and the rest, 42% (500m), is in serious condition, out of which the 100 m already failed. On the contrary, in the opposite lane, 58% (700m) was in poor condition, while 42% was in good functioning condition. On the third sample road corridor, the PCI result showed that both upward and downward directions have 50% Good pavement condition and 50% poor condition. The upward direction’s 200m is already in the failed category. Accordingly, the emission measurement of the vehicles along different distressed and grade geometries shows, as the v emission is increasing. Also, when the vehicle's emission measured along the roads different grade positions its emission amount also increases. This study showed that driving along distress and steeped grade road corridors have a significant impact on the number of vehicles related emission.	en_US
dc.title	Evaluation of the Impacts of Asphalt Pavement Distress and Road Geometry on Vehicle Emission: A Case Study on Selected Road Corridors in Addis Ababa	en_US
dc.type	Thesis	en_US