Mona MosallanejadMasoume Soltan Mohammadi Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, IranDepartment of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran mosalla@gmail.comhoma_soltan@yahoo.com International Journal of Fundamental Physical Sciences (IJFPS) 5 3 82-86 September, 2015 2231-8186 https://doi.org/10.14331/ijfps.2015.330091 Due to a strong need for lane changing, turbulence in traffic flow is created in weaving sections, decreasing speed and capacity. This study develops and validates two models to predict speed rates in weaving and non-weaving traffic on nine arterial sections in Tehran. Results show that increasing weaving density and lane change rate reduce speed. The proposed models outperform HCM 2010 under similar conditions. weaving speed rates, non-weaving speed rates, weaving section, speed, lane changing https://creativecommons.org/licenses/by/4.0/