National Park Service Traffic Monitoring Services
To assure high quality of short-term and continuous traffic data used in generation of traffic statistics, ARA developed traffic data quality control/quality assurance procedures specifically for the National Park Service (NPS), as well as a methodology for summarizing short-term and continuous ATR traffic data using principles outlined in the AASHTO Guidelines for Traffic Data Programs and the FHWA Traffic Monitoring Guide, as it applies to park roads. ARA also developed the NPS traffic database to store current and future traffic information for park roads. Information was provided for each road link identified in the traffic study and for each 0.02-mile increment to assure compatibility and linkage with the National Park Service’s Road Inventory Program (RIP) database. GPS coordinates and mile point information were provided for each traffic road segment to facilitate linkage with GIS or other linear reference systems.
ARA’s work under this project included preparation of traffic count plans, planning, scheduling, and mobilizing to 33 designated National Parks where traffic data counts were collected at temporary locations. Traffic counts included short-term 48-hour traffic volume counts and manual 8-hour vehicle classification and occupancy counts. In addition, traffic data from permanent automatic traffic recorder (ATR) sites were used to analyze seasonal traffic patterns, generate traffic adjustment factors, and compute seasonal and annual average daily traffic volumes and other traffic statistics for park roads.