Doing some quick math on their self-reported 4% error rate in optimal conditions. If flock had nationwide coverage, there'd be at least 9.6m of the 242m american drivers having their plate read wrong. When you account for Roseville PD's 71%, that 9.6m jumps to 171.8m.
In one California town, Flock misread license plates in 71% of the time. Out of a sample of 1,427 alerts that Flock sent to police in the town of Roseville, alerts that flagged vehicles as stolen or used in a felony after they passed one of the city's Flock cameras, 71% were inaccurate.