Assessing Effect Of Speed Hump On Traffic Flow In Addis Ababa At Selected Segments

Road And Transportation Engineering Project Topics

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In Addis Ababa the speed calming devices are installed on all road hierarchies with a posted speedrnlimit of 30km/hr for LS, CS&SAS and RR 50km/hr. respectively. Due to the lack of clear and uniformrndesign standards and guidelines for the installation of speed humps in Addis Ababa led to theirrnexistence on streets with heavy traffic volumes, which caused considerable traffic delay at the locationsrnof speed humps. The speed hump geometry (Length & width), grade of road along speed hump, speedrnof vehicles, delay and counted vehicle are used for analysis to generate a regression model. The researchrnhas been worked with qualitative(questionary) and Quantitative (direct study) which try to associaternthe two approaches. rnIn this thesis work, the hump geometry characteristics, geometry of the road, speed of each individualrntravelling vehicles and delay of vehicles are the main parameters that studied. rnAs per the analysis model the geometry of speed hump has variable effects on vehicle movement atrnupstream approaching distance of the vehicles. Up to 25-meter upstream distance is used which a carrnlocates at the spot speed of cars approaching the humps with free flow speed taken asrnfirst point that 25m before speed hump and can catch up to enough vehicle. rnThe overall result shows that the average maximum speed reduction of 16.66km/hr,15.2km/hr,13.8rnkm/hr,11.31km/hr. &9.67 km/hr. for (Car), (Bajaj, cycle & motor cycle), (Pick up, Mini bus Taxi),rn(Medium Bus Truck) and (Large Bus & TT) respectively. From the delay analysis, the car group hasrnmaximum delay value (164.5 Veh. /min) than other vehicle groups. In the model, the speed humprnheight, length and grade of the road has direct relation with the delay at upstream of the speed hump.

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Assessing Effect Of Speed Hump On Traffic Flow In Addis Ababa At Selected Segments

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