Weaving is defined as the crossing of two or more traffic streams traveling in the same general direction along a significant length of the roadway without the aid of traffic control devices. Weaving segments are formed when a merge area is closely followed by a diverge area, or when a one-lane on-ramp is closely followed by a one-lane off-ramp and the two are joined by an auxiliary lane. Highway Capacity Manual 2010 proposed a methodology to estimate the level of service at weaving segments. This methodology is adopted for the present study and applied to two weaving segments in Izmir, Turkey. The purpose of this study is to identify the level of service at weaving segments.