The biggest traffic jams in Kalpaka and Raina streets form in early morning and evening hours in the direction from Lauma residential area to city centre. As show results of a research and people survey, traffic jam is created due to several reasons. First of all, bus stop in the Kalpaka street before the rail crrossings interfere with the traffic flow. If the bus has stopped in the bus stop and drivers do not break the rules and do not cross the continuous line, it is creating a traffic jam. Secondly, traffic flow is being obstructed because of the bad condition of the rail crossings, which creates the necessity to decrease the driving speed, as well as Raina, Kapsetas and Year 1905 streets cross in case of intense traffic creates delays.