Road transport has an impact to one degree or another on the life of every person. The article discusses approaches to assessing the costs caused by the deterioration of traffic conditions, which are subdivided into individual and social ones. Assessment of total costs should be carried out when adopting traffic management measures. The proposed approaches made it possible to estimate the individual costs caused by traffic management measures using the city of Irkutsk as an example.

The article assesses understanding and interpretation of scientific categories «reliability», «refusal», «congestion». The possibility of using the service level indicator as a criterion of reliability of functioning of street- road network is substantiated, bearing in mind that it reflects in a complex the data on economy, convenience and traffic safety, and through this, the state of a transport flow. Different approaches are given to determine the level of service, to classify features and signs of the work performed. Further directions for improving reliability of highways, searching for the most variable indicator of reliability of the urban transport network are formulated. Keywords: street-road network, reliability, congestion, flow, failure, service level, time buffer, buffer index.

The article provides a description of such parameters for assessing the quality (efficiency) of the functioning of roads as travel time and buffer indices. A model describing the daily dynamics of travel time along a route, taking into account the possible presence of a traffic light object and an unregulated pedestrian crossing, is proposed. Using the model, the dependence of the accuracy of determining the temporal and buffer indices on the frequency of measurements is determined.

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The article presents the results of the experiment of determining of the motor oil quality. The article gives the results of calculating the economic effect of determining the quality of motor oil at a car service station.