Clearly if all the junctions in the model were a mile apart, TRANSYT would be of little use. The longer the links are the more dispersion will occur and there will be an associated reduction in the potential benefit gained by good coordination of traffic signals. The mean modulus of error (MME) value, reported in the cyclic flow profile (CFP) graphs in the TRANSYT output is a measure of how far the profile of arrival flow deviates from the mean. This gives an indication of the benefit of good coordination – a value of zero indicates no benefit. The spread of the CFP of the flow up to the stopline (i.e. the IN-profile) will also indicate the spreading out of the traffic by the time it has reached the downstream link.