Abstract
Despite efforts to slow down motorized traffic on residential streets by setting the speed limit 30km/hr., excessive speeds on these roads are very common causing traffic safety problems. Speed humps have been known as traffic calming devices that can be used to effectively reduce speeding problems. The effectiveness of speed humps has been well documented in the past. However in previous studies it has found that, hump-caused speed reduction was observed unstable, which may be influenced by several external factors such as presence of intersection, road crossing, road geometry etc. This study, therefore; was designed to identify the external factors which may affect the inconsistency of speed reduction in free flow after installation of hump. A multiple linear regression analysis was used for the modeling effort. The result shows that, study street length, shape of hump, presence of intersection and crossing etc. are associated with speed where hump is present.
