Application of Global Positioning System (GPS) to Travel Time and Delay Measurements-Summer 2005

Since 1996, the Global Positioning System (GPS), a worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations, has collected travel time and delay data on major roadways throughout Delaware. The GPS statistically matches manual data collection in accuracy and efficiency and therefore continues to effectively collect data within Delaware today. Every year, a report is compiled documenting and summarizing the collected data. The "Application of Global Positioning System (GPS)to Travel Time and Delay Measurements - 1997 Phase" report describes the testing of the applicability and accuracy of the GPS system, while the 1998 Phase report provides step-by-step instructions for data collection. In past years travel data was collected during peak-travel times between mid-September and Thanksgiving. In 2002, data collection expanded to include summer peak-travel times as well. In 2003, the summer mileage covered increased from 652 to 896 miles, and in 2004, this mileage increased again from 896 to 1006 miles. This report describes the methodology used to collect summer peak-travel time data and includes a summary and conclusion of the collected data.