Metropolitan areas have long had a history of experiencing vehicular traffic congestion particularlyrnduring peak hours for different reasons. One overlooked factor among such contributory reasonsrnis the disorganized utilization of similar lanes by a mix of light automobiles with one or twornpassengers on one hand and high occupancy vehicles with well over four passengers on the otherrnhand. High occupancy vehicles are usually public transportation motors that continuously makernfrequent stops to pick up and deliver passengers from/to multiple destinations along a certainrncorridor. Therefore, the blending of vehicles that make a non-stop through movement with suchrnhigh occupancy vehicles naturally results in a poor lane utilization and reduced level of service. rnAddis Ababa is no stranger to this phenomenon as over one fourth of vehicular traffic on mostrnmultilane highways comprises of high occupancy vehicles. The problem is magnified as trafficrnmanagement schemes that are non-infrastructural in nature are hardly exercised. This researchrnfocused on quantifying to what extent level of service on multilane highways could be improvedrnby dedicating a single lane to high occupancy vehicles. Accordingly, a specific route was carefullyrnchosen as a case study and the currently existing level of service was determined. In order torninvestigate the possible room for improvement, straight through lanes both in the middle and curbrnside were assigned to high occupancy vehicles one after the other and the new level of service forrneach lane was determined with the aid of a simulating software. rnResults indicated that dedicating outer through lanes to high occupancy vehicles on the chosenrncase study can result in better lane utilization and improved level of service from D to C as evidentrnfrom the registered shorter travel time as well as increased average speed.