A Macroscopic Performance Evaluation of Unsignalized Intersections in Mixed Traffic: A Case Study of Adama City, Ethiopia
Abstract
This study evaluated three unsignalized intersections in Adama City, Ethiopia, which were identified as critical congestion points. Performance analysis confirmed all were operating under Level of Service F, characterized by extreme control delays (51-210 seconds/vehicle) and unsustainable saturation levels (v/c ratios of 2.38-6.15). In response, targeted mitigation strategies such as road widening and signalization were developed and modeled. The results demonstrated the high effectiveness of these interventions, showing a dramatic reduction in delays and an improvement in the Level of Service to B, C, or D. These findings offer a validated, actionable strategy to significantly increase capacity, restore operational efficiency, and enhance safety.
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