Speed Hump Effect on Pavement Condition (Addis Ababa City Road case study)
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Date
2020-01
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Addis Ababa University
Abstract
One of the traffic calming devices used in Addis Ababa, Ethiopia is a speed hump due to low
cost and ease of installation. However, these speed humps are randomly placed without
proper engineering studies and justification. Due to this, speed fluctuations and the excessive
decelerations and accelerations, before and after speed humps, over small distances and
infiltration of water to the pavement surface. The pavement condition near to the speed
humps show failure and deterioration.
The research study was initiated to investigate the effect of speed humps on pavement
condition and also to analyze the relationship between speed hump characteristics and
pavement condition. The research methodology involved selecting representative samples of
road segments that have at least one section with speed humps. For the selected section
pavement condition and IRI data collected from AACRA. Road and speed hump
characteristics data collected from site direct measurement. Collected data analyzed and
compare the pavement condition of these sections with and without speed hump. Regression
analysis models were developed to represent the relationships between pavement conditions
and hump characteristics.
Pothole and Raveling were the most widely observed distress at both sections with and
without speed hump. But their frequency was higher on sections with speed humps.
Pavement condition index (PCI), in road sections with and without speed hump, was
calculated from the pavement condition data. The analysis showed that the presence of speed
humps significantly affected the pavement condition, reducing the PCI of the pavement
sections by 34 PCI points and increase IRI value by 3.4 IRI points. The relation between
speed hump characteristics and pavement condition shows that the speed hump height and
density have a negative relation to pavement condition index value and the speed hump width
has a positive relation with PCI value.
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Keywords
Speed humps, Pavement condition index, International roughness index