Since the mid 1990s, the National Performance Indicators (NPI) Program has employed floating car surveys to measure travel times on representative routes a few times a year as a means to monitor the performance of a road network in a jurisdiction. In recent years, some jurisdictions felt that the limited amount of survey data in the NPI Program is insufficient and may not present a true picture of prevailing traffic conditions, especially in the larger cities where congestion and peak-spreading are common. This paper presents the definitions and calculations of five new network performance indicators, which are to be measured online with the use of real-time data from traffic control systems or other automatic vehicle identification techniques. This paper will also report on the implementation plan. (a).
Abstract