where d = GR, LP, CV or CS, indicating the data sources, Lsis the length of segment s, and v̄s,j d is the space mean speed over the segment s at time interval j based on data source d.The space mean speed v̄s,j d is calculated in two ways in the literature. Double-loop detector is a key source to measure vehicle speed (Lin et al. 2015a). In this case, v̄s,j d is defned as the harmonic mean of the speeds of vehicles passing the loop detector at the end of segment s during a time interval j, which is calculated as (Zhang 2006).
where d = GR, LP, CV or CS, indicating the data sources, Ls<br>is the length of segment s, and v̄s,j d is the space mean speed <br>over the segment s at time interval j based on data source d.<br>The space mean speed v̄s,j d is calculated in two ways in the <br>literature. Double-loop detector is a key source to measure <br>vehicle speed (Lin et al. 2015a). In this case, v̄s,j d is defned <br>as the harmonic mean of the speeds of vehicles passing the <br>loop detector at the end of segment s during a time interval <br>j, which is calculated as (Zhang 2006).
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