This research offers assessment of the urban streets in Lattakia city center. These arterials form main traffic links between major regions. Therefore, Traffic improvement on these streets will have great effect on improving level of service (LOS), increasing speeds, decreasing delay time, decreasing the emissions and traffic accidents. This research was done on six streets surrounding Lattakia city center for defining LOS. Floating vehicle was used in this study. Many trips were executed during free flow and peak periods for measuring free flow speed, Travel time and average speed. Every street was divided into many sections. This study uses field method and computation method adopted by Highway Capacity Manual (HCM2000) for defining LOS on streets and comparing results. This study showed low values of LOS for most sections and it indicated deference between field method and computation method. Also, it expressed the necessary to take suitable procedures to increase LOS on these streets.