CALIBIRATION OF GREENBERG AND GREENSHIELD MODEL FOR ABUJA TRAFFIC

Abstract

Despite the extensive use of Greenshields and Greenbergs models, there is a lack of comprehensive studies that specifically focus on their application to a particular road section. This research arises from the need to investigate the suitability of these models for accurately describing the traffic characteristics of road B6 and B12 in Abuja city, considering factors such as traffic volume, speed, and density. The result shows that; The range of stream speed for roads B6 and B12 are respectively 12km/h to 51km/h and 32km/h to 103km/h, the free flow speed for Greenshield model at road B6 was 36.35km/h which is approximately half that of road B12, consequently, Road B6 has a jam density of 58veh/km which was about three (3) times higher than that of road B12. The R2-value obtained for Greenshield model was 0.623 with a corresponding 0.942 of Greenberg model in Road B6, while for road B12, the R2-value obtained for Greenshield model was 0.719 with a corresponding value of 0.956 for Greenberg model. Hence, Greenberg was selected the best model for the two roads.