TwoWay Stop Control Potential Capacity with Upstream Signal
Jeanne Bowie Kinney Engineering 
I have a question about how to apply equations 1933, 1934, and 1935. Under equation 1933, if the total conflicting flow for a movement is less than the platooned flow rate, the unblocked conflicting flow rate is set to zero. In equation 1935, if the unblocked conflicting flow rate is zero, then the denominator is zero and the equation cannot be used. In this situation, what should be used as the potential capacity? Do you just use the potential capacity if there are no upstream signals (equation 1932), or is the conflicting flow during the unblocked period actually supposed to be set to a value other than zero? 

Erik Ruehr VRPA Technologies 
Based on my reading of Equation 1935, if the unblocked conflicting flow rate is zero, the potential capacity will also be zero. I don't see a way that the denominator of Equation 1935 could ever be equal to zero. In the case of any problems with the upstream signal calculation, an approximate answer can be determined by igoring the upstream signals portion of the procedure and obtaining an answer assuming there are no adjacent signals. 

Jeanne Bowie Kinney Engineering 
For equation 1933, I ended up assuming that the value of conflicting flow during the unblocked period was very small (0.1, for instance) under the "otherwise" condition and was able to complete my analysis. 
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