DOI: 10.15787/vtt1/wzgfle
title: Analysis of SHRP2 Speeding Data

description: Project Description Phase 1: Speeding-related crashes continue to be a serious problem, and the proportion of speeding-related fatal crashes has changed little over a decade. Speeding is a complicated behavior that varies by driver and situation, and it also seems to be a common behavior, with most drivers reporting they drive over the speed limit at least some of the time. This dataset supported an initial exploration of the SHRP 2 data with regard to speeding. The objectives of that project were as follows: Identify, catalogue, and categorize SHRP2 data variables related to target research questions. Conduct test analyses using multiple approaches on a few cases and provide a detailed plan for an analysis of the complete sample to answer the target questions. Collect the SHRP2 data for these variables, code the variables, and produce a cleaned data file with corresponding data documentation. Analyze the data with regard to the speeding-related questions targeted for this study. Produce two final reports: one report on the findings from analysis of the speeding questions targeted, and a second report on the methods / process used to create the data file. Phase 2: Speeding continues to be a major factor in traffic crashes and fatalities. In 2018, 25% of all fatal crashes were identified as speeding-related. However, despite the importance of understanding it, studying speeding behavior poses many challenges. The Strategic Highway Research Program 2 (SHRP2) Naturalistic Driving Study has provided a unique dataset that has the potential to overcome some of these challenges and greatly enhance our understanding of speeding behavior. Battelle recently completed the first ever study using the SHRP2 speeding data (Contract No.: DTNH22-11-D-00229 / 0002). For the current project, the goal is to further develop the SHRP2 Speeding Database created during Phase 1 and conduct two new analyses to better understand drivers' speeding behavior. The primary addition of this new project to the existing SHRP2 Speeding Database will be the use of video data from drivers' vehicles, which will provide better data to define, identify, validate and predict speeding and aggressive driving behavior. In this follow-up study using the SHRP 2 Speeding data, Battelle will address the following target research questions on speeding and aggressive driving behavior: What is the role of certain pre-crash driver and situational factors in predicting speeding-related crashes (and near crashes)? What is the nature of speeding and aggressive driving behaviors in ambient traffic? Data Request Scope Phase 1: Video reductions for critical event and baseline epochs Size: All available epochs as of V1 of InSight Driver IDs, Driver demographics Size: All available records as of V1 of InSight Trip summaries Size: All available records in V1 of InSight with the following characteristics Trip Duration &gt;= 15 minutes % CTRE Van Coverage &gt;= 50% Max Speed &gt;=25 mph Time Moving &gt;= 50% * Trip Duration Trip time series sample Size: Trips selected by Battelle The primary study dataset consisted of the following number of trips selected by Battelle: Pennsylvania 16,344 trips Washington 22,974 trips Florida 67,163 trips Indiana 21,300 trips North Carolina 49,313 trips New York 69,543 trips Phase 2: Data for three types of driving epochs: 750 speeding related safety critical events identified by Battelle 1,532 base epochs, selected by Battelle from the existing Balanced Baselines and Additional Baselines 260 forward video trip segments identified by Battelle. Event details were provided for the safety critical events and baselines. The time series data and Navteq map data were provided for 60 seconds prior to the event for these groups. The time series data and Navteq roadway data, along with forward video, were provided for the duration of the forward video trip segments. In order to protect participant personally identifying information (PII), origin and destination buffers were employed. Position information and forward video, as applicable, were not provided for epochs that overlapped with these buffers. Position information cannot be released for crash events and forward video for crash events. Data Specification The variables included in this dataset can be found in the accompanying attached data dictionaries: Video reductions for critical event and baseline epochs Please see Event_Table_Data_Dictionary.pdf Driver IDs, Driver demographics Please see DriverDemographic_DataDictionary.pdf Trip summaries Please see Trip SummaryDataDictionary.pdf Trip time series sample Please see TimeSeriesData Dictionary.pdf Time series data was rectangularized at 1 Hz. Files where latitude or longitude were not available were excluded. Additional Analyses and Speeding Database Development This dataset consists of data reductions developed for the study of speeding in the SHRP2 Analysis of Speeding Data study, with new data developed in the current SHRP2 Speeding Data: Additional Analyses and Speeding Database Development study. The Analysis of SHPR2 Speeding Data study examined the problem of speeding using a sample of SHPR2 data from each of the six data collection sites included in the SHRP2 Naturalistic Driving Study. Time series data from each site were processed to identify Free-Flow Episodes (FFEs), in which the driver had opportunity to speed, and Speeding Episodes (SEs). Three data reductions that characterize driving behavior within the respective Trip, FFE, and SE were developed: (1) Trip-level reductions, (2) Free-Flow Episode (FFE) reductions, and (3) Speeding Episode (SE) reductions. Details describing how these datasets were produced and analyzed are provided in the Findings Report (Richard et al., 2018) and Methods Report (Brown & Richard, 2018) from that study. Two new data reductions were developed in the current study to address one of the study’s research questions: What is the nature of speeding and aggressive driving behaviors in ambient traffic? These reductions provide data that researchers can use to examine aggressive lane changes and tailgating while speeding. The data reduction and additional information can be found in the SHRP2 Speeding Data: Additional Analyses and Speeding Database Development zipped folder in the Files tab below.