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A new simplified theoretical approach for the determination of capacities at unsignalized intersections has been developed on the basis of the method of additive conflict streams. This method is much easier to handle than the method of gap acceptance. It avoids many of the theoretical complications inherent in the method of gap acceptance, which, under certain circumstances, seems to be unrealistic. The new method has been developed for potential intersection configurations when one street has priority over the other. A calibration of the model parameters is given for German conditions. The new procedure can deal with shared lanes, short lanes, flared entries, and cases of so-called limited priority. For the estimation of traffic performance measures such as average delay and queue lengths, the classical methods can be applied.

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