This research study was sponsored by U.S.DOT/AASHTO with money flowing through Utah Department of Transportation. This study proposed to explore how driver behavior and performance was impacted while in the vicinity of closely spaced interchange ramps. More specifically, this study was focused on identifying differences in driver behaviors and performance in freeway merging and diverging areas near interchange ramps, and estimating the impacts of ramp spacing and auxiliary lane presence on driver behavior and performance. Additionally, this study investigated whether drivers adjust the their cell phone usage depending on driving demands, and evaluated the effects of cell phone use on driving behavior and driver crash risk near freeway merging and exit locations. The study scope covered the scenario of an entrance ramp followed by a downstream exit ramp (EN-EX), with or without an auxiliary lane between entrance and exit ramps. Drivers of interest will include “merging” drivers (i.e., merging onto the freeway), “exiting” drivers (i.e., exiting the freeway), and through moving drivers (i.e., traveling on the freeway mainline prior to and after the ramp combinations). The dataset delivered consisted of a sample of timeseries variables collected for multiple drivers as part of the SHRP2 Naturalistic Driving Study. Time-series data (de-identified) was requested from 8 roadway segments - 4 located in Washington, and 4 located in North Carolina. 240 trips were delivered for each segment, where the trips were evenly divided (80 trips each) among "Entering" vehicles, "Exiting" vehicles, and "Through" vehicles. "Entering" vehicles enter the analysis area from the on-ramp and leave the analysis area on the highway, while "Exiting" vehicles enter the analysis area on the highway and leave the analysis area via the off-ramp. “Through" vehicles enter and leave the analysis area on the highway, not using the ramps. Time series data was delivered for a combined total of 1920 trips along all segments. The time series data included: vehicle trajectory data (e.g., GPS coordinates, acceleration, and velocity), vehicle lane position data (e.g., distance from lane markings, steering wheel position), driver head position data (head position, head angle), and radar range data for nearby vehicle positions. The time series data was needed for the portion of a driver’s trip over the study road segment, so the requested time series data started 10 seconds before entering the study road segment and ended 10 seconds after exiting the study road segment. Cell phone usage data included indicators noting whether a driver is talking on the cell phone (both with phone and handsfree phone), manually manipulating (dialing/texting) a cell phone, or if the driver was not distracted while traveling through the study location.