Abstract — This study analyses traffic flow rates from reliability stand point. The aim is to determine the quantity of traffic flow during adverse weather conditions and to see if rainfall inhibits the flow. Data was collected from a single lane carriageway on which traffic flow data was collected for 16 weeks. The data was reorganised to incorporate the current PCE values of vehicles for conversion of flow rates from vehs/hr to PCE/hr. The fundamental diagram method was used to predict the capacity of the roadway and these were used together with the observed flow rates for reliability analysis. The results show that reliability of the road capacity diminished under heavy rainfall when the flow regime is freeflowing. Reliability analysis could be used as an additional measure of effectiveness for flow rates assessment
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