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Naturalistic Driving Study
The SHRP 2 Naturalistic Driving Study (NDS) will allow us to record and study the driving behavior of a large sample of drivers in their personal vehicles. Reports related to the SHRP 2 NDS are collected on this page.
Development of Analysis Methods Using Recent Driving Study Data (SHRP 2 Report S2-S01A-RW-1)
Posted April 9, 2012
In anticipation of the large volume of data to be collected during the SHRP 2 naturalistic driving study (NDS), several projects were undertaken to demonstrate that it is possible to use existing NDS data and data from other sources to further the understanding of the risk factors associated with road crashes. More specifically, the four projects conducted under the title Development of Analysis Methods Using Recent Data examined the statistical relationship between surrogate measures of collisions (conflicts, critical incidents, near collisions, or roadside encroachment) and actual collisions. SHRP 2 Report S2-S01A-RW-1, Development of Analysis Methods Using Recent Data, presents the results of one of these projects. The primary objective of this work was to establish an analytic foundation for using conflicts and near crashes as surrogate measures. The project introduced a counterfactual analytic approach suggesting that a traffic event qualifies as a crash cause under two conditions: (a) both the event and the crash occurred and (b) had the event in question not occurred, then the crash also would not have occurred. Data from site-based field studies and vehicle studies were used to extend these ideas from a trajectory model to more complicated scenarios. The report introduces an approach to microscopic (i.e., individual event) modeling of crash related events, where driver actions, initial speeds, and vehicle locations are treated as inputs to a physical model describing vehicle motion. SHRP 2 Report S2-S01A-RW-1 is only available as an Adobe PDF.
Integration of Analysis Methods and Development of Analysis Plan (SHRP 2 Report S2-S02-RW-1)
Posted February 23, 2012
The objective of the SHRP 2 Naturalistic Driving Study (NDS) is to reduce traffic injuries and fatalities by preventing or reducing the severity of collisions. Every 1% reduction in crashes can prevent 330 deaths and about $2 billion in annual medical expenses and other losses from these crashes. SHRP 2 Research Report S2-S02-RW-1: Integration of Analysis Methods and Development of Analysis Plan describes the analysis plan for the SHRP 2 NDS. High-priority research questions were identified in Phase I. Phase II identified the critical elements and issues to address in the analysis of the SHRP 2 NDS data and provided sample work plans for five high-priority research questions. The resulting analysis plan will guide the development of the subsequent Safety Project S08, Analysis of In-Vehicle Field Study Data and Countermeasure Implications, and assist researchers planning to use the SHRP 2 NDS data. Report S2-S02-RW-1 is only available as an Adobe PDF.
Evaluation of Data Needs, Crash Surrogates, and Analysis Methods to Address Lane Departure Research Questions Using Naturalistic Driving Study Data (SHRP 2 Report S2-S01E-RW-1)
Posted October 13, 2011
A large component of the safety research undertaken in SHRP 2 is aimed at reducing injuries and fatalities that result from highway crashes. Through a naturalistic driving study (NDS) involving more than 3,000 volunteer drivers, SHRP 2 expects to learn more about the interactions among driving behavior and vehicle and roadway characteristics. In anticipation of the large volume of data to be collected during the SHRP 2 NDS, several projects were conducted to demonstrate that it is possible to use existing NDS data and data from other sources to further the understanding of the risk factors associated with road crashes. More specifically, the four projects conducted under the title Development of Analysis Methods Using Recent Data examined the statistical relationship between surrogate measures of collisions (conflicts, critical incidents, near collisions, or roadside encroachment) and actual collisions. SHRP 2 Report S2-S01E-RW-1: Evaluation of Data Needs, Crash Surrogates, and Analysis Methods to Address Lane Departure Research Questions Using Naturalistic Driving Study Data presents the results of one of these projects. Report S2-S01E-RW-1 is only available as an Adobe PDF.
Roadway Measurement System Evaluation
Posted August 18, 2011
SHRP 2 Research Report S2-S03-RW-01:
Roadway Measurement System Evaluation documents the evaluation of automated/mobile data-collection services to provide data on roadway features and characteristics considered important for safety analysis, especially analysis of data from the SHRP 2 Naturalistic Driving Study (NDS). The Safety research program requires data on roadway features and characteristics to support analysis of the NDS data. To obtain these roadway data, SHRP 2 set out to procure the services of a vendor to collect data at highway speed. However, at the time, no validation of vendors’ capabilities to collect these data was publicly available. As a result, SHRP 2 conducted its own evaluation—the rodeo. The objectives of the rodeo were to determine the capabilities of the industry (as represented by 10 participating vendors) and to prequalify a list of vendors to bid on the project that would collect new roadway data in the six NDS sites throughout the United States. Report S2-S03-RW-01 is available as an Adobe PDF.
Design of the In-Vehicle Driving Behavior and Crash Risk Study: In Support of the SHRP 2 Naturalistic Driving Study
Posted March 30, 2011
SHRP 2 Report S2-S05-RR-1: Design of the In-Vehicle Driving Behavior and Crash Risk Study provides a summary of the key aspects of the planning effort supporting the SHRP 2 Naturalistic Driving Study (NDS). SHRP 2 Safety Project S05: Design of the In-Vehicle Driving Behavior and Crash Risk Study (Study Design) designed the SHRP 2 NDS, which will collect data—on the order of 1 petabyte (1,000 terabytes)—on “naturalistic,” or real-world, driving behavior over a 2-year period beginning in fall 2010. The resulting data will provide a wealth of information regarding driving behavior, lane departures, and intersection activities, which is anticipated to be of interest to transportation safety researchers and others for at least 20 years. The report is available online as an
Adobe PDF document and in hardcopy through the TRB bookstore. An e-book of the report is available in the Google eBookstore.
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