Urban traffic speed mapping in Ghana: The use of GPS/GIS

Joseph Owusu1, Francis Afukaar 1, and B.E.K. Prah 2
1.    Building And Road Research Institute (B.R.R.I), Council For Scientific and Industrial Research (CSIR).

2.    Kwame Nkrumah University of Science and Technology, Department of Geomatics Engineering.

College Of Engineering

Road traffic congestion is a major challenge which is being faced by motorist in the Kumasi metropolis. The current traffic speed at any section of a roadway affects the quality of traffic at the time. Whereas excessive speeds affect the severity of road traffic accidents, crawling speeds in the urban environment is also indicative of congestion. The GPS-GIS integrated system provides a real-time meaningful location and status of the vehicles in the network. Using Global Positioning System (GPS), a more resourceful monitoring of vehicle speed and positioning was achieved. The system was able to show the second-to-second positional changes in speed and directions of vehicles travelling in the urban environment.

Also, the traffic data such as vehicle speed and direction of traffic flow was imported into a Geographical Information System (GIS) environment.
Using the geographic components in a dataset and visualizing the results in a map provided a clearer picture of the traffic-state of every route in the network.
The GPS-GIS clearly indicates the road sections where speeds are unacceptable and gives transport planners the option to choose the desired speed management technique to improve the traffic system.


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