National Traffic Service is one of the leaders in the freight audit and bill payment auditing industry. Founded in 1956, it provides freight auditing and payment services and software, information processing services, and logistics consulting. The company checks for all overcharges, including duplicate invoices, missing or incorrect discounts, late deliveries, inaccurate classifications, incorrect tariffs, wrong mileage and zip codes, accessorial charge errors, extension and addition errors, misrouting for carrier convenience, and various other factors. It also provides reports on various areas of operation, including carrier activity, management summary, customer activity, payment information, account code analysis, carrier transit time, vendor activity, and accrual analysis. It is located in Amherst, N.Y.