Assessing The Effect Of Digital Countdowns At Signalized Intersection In Addis Ababa

Signalized intersections are important elements of urban road networks, and their efficiency andrnsafety rn rn rn rn rn rn rn rn rn rn rn rn rnsignificantly rnimpact rnthe rnperformance rnof rnthe rnentire rnroadway rnnetwork. rnThere rnarerndifferent rn rn rn rn rn rn rn rn rn rn rn rneducational, rnenforcement rnand rnengineering rnmeasures rnthat rnarernattemptedrnto rnimprove rnsafety rnand rn rnefficiency at a signalized intersection.rnA traffic signal countdown timer is an engineering device rnthat displays the remaining time, typically in seconds, of the current signal phase. Because of therndifference in drivers behaviorrn rn rn rne,rndifferentrnprevious studies associated with the rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rneffects rnof rnsignal rncountdownrnhas rndifferent rnoutcome,rnandrnthis rnstudyrntries rnto rnassessrnthe rneffect rnof rnsignal with countdown on intersection safety and efficiency on the selected intersections locatedrnin rn rn rn rn rn rn rn rn rn rn rn rn rn rnAddis rnAbaba.rnFor rnthis rnresearch rnmatter, rnthe rnresearcher rnselected rnsix rnintersections rnin rnAddis rnAbaba, three with a countdown timer and the rest three without countdown timer.rnData collection was done using video recording andrn rn rn rndriver’srnattitude surveyrnfrom the end-users. rn rnTo measure intersection safety and efficiencyrnstartup lost time, red light violation, dilemma zone, rn rn rnand the driver's decision were identified. rnStartuprnlost time was estimated and found that the red rnsignal countdown helped to reduce the startup lost time. Green signal countdown (GSC) and Redrnsignal countdown (RSC) affectsrn rnthe red light violations by increasing violations at the end of red rnand decrease at the end of yellow. The presence of signal countdown enlarged the range of typernII dilemma zone at the onset of yellow. A binary logistic regression model is developed to studyrnthe rn rn rn rn rn rn rn rn rn rn rn rn rneffect rnof rnsignificant rnfactors rnon rndriver’s rndecisionrnmaking;rnand rndistance, rnapproach rnspeed, rn rn rn rn rn rn rn rn rn rn rn rnremaining rntime,rnand rnsignal rnconditions rnwere rnfound rnstatically rnsignificant rnto rnpredict rndriver’s rn rnprobability to stop or cross the intersection after onset of yellow. rnIn signal with countdown, the rn rn rndriver’s decision to cross is smaller than rnthe intersection without countdown. From the rndriver’s rn rn rn rnattitude survey,rnit wasrnfound signal with countdown is the most recommendedrnin order to reduce rn rn rn rn rn rn rn rn rn rn rn rntraffic rncrashesrnand rnto rnmaximize rntrafficrnefficiency rnby rnimproving rndriver’srndecisionrnmaking. rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rnAdditionally,rnit rnis rnfound rnthat rnthe rnmost rndominating rnreasons rnof rnred rnlightrnviolation rnin rnsignal rnwith rncountdown are to save time, if there is no traffic police, inadequacy of allocated green time andrncarelessness towards crash.

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