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There are no specific way to calculate length of acceleration lane (LA). Even AASHTO 2004 Green book also only include tables to predict minimum LA. However, from Highway Capacity Manual 2000 (exhibit 25-5) shows calculation to get flowrate in lane 1 and lane 2. In the equation exists LA variables. Therefore, if you can know value of freeway demand flowrate (in pcu/hr) and flowrate in lane 1 and lane 2, then i guess you can get the answer for LA

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