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 in real time with the use of traffic control systems or other automatic vehicle identification techniques. This paper will also report on the implementation plan. (a) For the covering entry of this conference, please see ITRD abstract no. E217099.
Samenvatting