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SOAP/M was a microcomputer version of the Signal Operations Analysis Package. It carried out a complete design for signalized intersection timing, including calculation of cycle length and splits. It produced an evaluation of the intersection performance in terms of delay, stops and fuel consumption. Graphic outputs were available. A left turn analysis could be performed with separate capacity calculations made for protected phases, unprotected phases and clearance intervals. 

The computational methodology was similar, but not identical, to the methodology used in the original IBM computer version of SOAP. SOAP/M accommodated only one set of design volumes, capacities, etc., whereas the original version dealt with a maximum of 48 contiguous time periods, each with its own characteristics. The complete phase sequence had to be specified for SOAP/Me. Phasing optimization was accomplished by a multiple run, trial and error procedure. The overall approach to design was based on an iterative process to minimize a weighted sum of delay and stops. Computation of delay and stops was based on the same model used in the TRANSYT program (1).