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DOI: 10.51456/IJEIT.2020.v10i02.001 Page 1 Impact of road geometric design elements on road traffic accidents in the city of Yaounde Cameroon MBESSA Michel WOUNBA Jean Francois NKENG George ELAMBO WANE TAMO Gilles Delore 1Head of the Department of Civil Engineering, National Advanced School of Public Works Yaounde, Ministry of Public Works, P.O. Box 510, Yaounde, Cameroon 2Department of Town Planning, National Advanced School of Public Works Yaounde, Ministry of Public Works, P.O. Box 510, Yaounde, Cameroon 3Director of the National Advanced School of Public Works Yaounde, Ministry of Public Works, P.O. Box 510, Yaounde, Cameroon 4Department of Civil Engineering, National Advanced School of Public Works Yaounde, Ministry of Public Works, P.O. Box 510, Yaounde, Cameroon Abstract: The objective of this research was to investigate the effect of road geometric design elements on road traffic accident occurrence in Yaounde. Collection of data relevant for this study was performed in two phases, beginning with the accident data collection and later the geometric and environment data collection. A total of 483 accident reports recorded from October 2018 to October 2019 were collected at the General Delegation for National Security (GDNS). These served two main purposes which were the determination of general accident characteristics and the identification of accident-prone locations (black spots) in Yaounde. On account of previous works, two main criteria (accident frequency and injury severity density) were then used for the identification of 11 road segments and 4 intersections as accident-prone locations. These accident-prone locations obtained were digitalized using Arch-GIS 10.3 tool to obtain an accident-prone location map. An investigation of the identified accident-prone locations was then performed using prepared forms to determine which roadway elements have a great influence on the occurrence of accidents. Results indicate that the reduction of road surface width, absence of sidewalk, absence of median markings, poor road geometric alignment, lack of access control, lack of appropriate parking space, absence of crosswalk, lack of channelization at intersections, presence of street vendors and waste accumulation have a significant impact on crash occurrence. This led to the proposal of solutions such as the design of paved sidewalks of adequate width and the provision of marked crosswalks for pedestrian safety, the provision of median markings to separate opposite streams of traffic, the design of appropriate channelization at intersections, provision of appropriate parking zones etc. to improve road safety.