Browsing by Author "Ton, Alice"

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    Computerized Crash Reports Usability and Design Investigation
    (Center for Transportation Studies, University of Minnesota, 2016-06) Morris, Nichole L.; Achtemeier, Jacob D.; Ton, Alice; Plummer, John Paul; Sykes, Jennifer
    Electronic crash reports are advantageous because they can limit missing data, transcription errors, and the space limitations of a single sheet of paper. Advancing electronic reports through user-centered design affords an opportunity to improve law enforcement officer’s (LEOs) ability to accurately, timely, and efficiently document crashes. Minnesota’s commencement of a new crash records database offered a unique opportunity for a redesign of its electronic crash report to best support LEOs. A well-designed electronic report will not only support LEOs in the line of duty but will also lead to more useful, complete, and accurate data for various state and federal agencies for analysis and policy decision making. The objectives of this project were to: 1) improve crash data reliability and validity, 2) develop a framework crash report interface based on human factors principles and usability requirements, and 3) reduce the mental workload and required steps for users. Project tasks included: heuristic and hierarchical task analysis, cognitive walkthroughs, validity and reliability testing, interviews, beta testing, and usability testing. The human factors principles and user-centric approach lead the iterative design process to produce a product with high levels of usability and intuitiveness. The project featured a cooperative approach among university researchers, state agencies, and a private developer to ensure that the knowledge, design, and results of the research effort was fully transferred into the final product. The resulting interfaces preliminarily suggest improved user satisfaction, along with data completeness and accuracy, and provide a resource for replication in multiple domains.
  • Thumbnail Image
    Item
    Examining the Impact of ASE (Automated Speed Enforcement) in Work Zones on Driver Attention
    (Minnesota Department of Transportation, 2016-01) Morris, Nichole L.; Cooper, Jennifer L.; Ton, Alice; Plummer, John Paul; Easterlund, Peter
    Each year, there are over 500 fatal crashes in work zones in the U.S., with over 100 road construction workers killed on work sites (NSC, 2011; FARS, 2011). Speed and distraction are among the top contributing factors to work zone crashes (Garber & Zhao, 2002; Mountain, Hirst, & Maher, 2005; Wilson, Willis, Hendrikz, Le Brocque, & Bellamy, 2006). The purpose of this study was to investigate the impact of different types of speed enforcement methods on driver attention in work zones. The investigation not only examined enforcement methods currently used in Minnesota, but also examined how implementing automated speed enforcement (ASE), which is not currently used in Minnesota, may influence driver attention and behavior in simulated work zones. Overall, the results do not appear to support the hypothesis that ASE without dynamic speed display sign (DSDS) improves driver attention in work zones. There is some evidence, however, that drivers did heighten their visual attention in work zones with ASE+DSDS enforcement. Drivers fixated on the secondary task display less frequently in the ASE+DSDS condition compared to other enforcement types while they traveled in the downstream portion of the work zone. The largest effects of the study were found among the age groups, with younger and older drivers exceeding the speed limit most often and varying their speed slightly depending on the type of enforcement present. Middle-aged drivers exhibited the greatest speed control and tended to abide by the speed limit to the same extent regardless of the type of enforcement present.
  • Thumbnail Image
    Item
    Human Factors of Vehicle-Based Lane Departure Warning Systems
    (Minnesota Department of Transportation, 2015-06) Edwards, Christopher; Cooper, Jennifer; Ton, Alice
    Run-off-road (ROR) crashes are a concern for two-lane rural and urban roadways throughout Minnesota due to the frequency by which they contribute to fatal crashes (Minnesota Crash Facts, 2013). Mitigating the severity of the ROR events is an on-going research goal in order to help reduce the number of ROR crashes. Examining countermeasures that may reduce ROR crashes is important to determine the most efficient and effective method of warning. Behavioral responses were examined through the use of an in-vehicle haptic-based lane departure warning system (LDWS) using a driving simulator. The study incorporated systematic variation to both the reliability of the warning and sequence of treatment conditions. An additional analysis examined the presence of behavioral adaptation after repeated exposure to the system. Severity of a ROR event was measured as the total time out of lane (TTL) and maximum lane deviation (MLD). Covariates (e.g. road shape) were examined to determine the influence they may have on the severity of a ROR. The results reveal overall LDWS efficacy. TTL was significantly longer when no system was active compared to when it was active. LDWS led to shorter duration of ROR events. Greater velocity was found to be highly predictive of longer TTL. MLD was also greater for baseline drives compared to treatment drives. No behavioral adaptation or system overreliance was detected, suggesting long term benefits of the LDWS. Drivers who actively engaged in a distraction task were at far greater risk of traveling greater and more dangerous distances out of lane.
  • Thumbnail Image
    Item
    A Next Generation Non-Distracting In-Vehicle 511 Traveler Information Service
    (Center for Transportation Studies, University of Minnesota, 2014-10) Morris, Nichole L.; Ton, Alice; Cooper, Jennifer; Edwards, Chris; Donath, Max
    This study investigates the current features of state and proprietary traveler information applications, elements of good design and usability, human factors issues regarding visual and cognitive distraction, and makes recommendations for the next generation of Minnesota’s traveler information application, MN 511. Traveler information systems were created to serve drivers by providing accurate information about traffic and road conditions before drivers began their trip. The advancement of cellular telephones provided a new opportunity for drivers to access traffic and road information en-route, but introduced considerable cognitive distraction on drivers navigating the complex phone trees. The evolution of traveler information systems onto smartphone applications has eased the cognitive demand previously imposed by phone tree systems, but has shifted the demand to drivers’ visual resources. The dichotomy between state-funded 511 travel information applications and proprietary traveler information applications is primarily determined by the features each contains. The common features included in the current proprietary traveler information applications provide insight into the opportunities for future iterations of MN 511 mobile applications. The MN 511 application can continue to improve by incorporating select features from proprietary applications, such as voice commands, route guidance, saved places, and travel time estimates, while taking into account cognitive workload and visual distraction. This is important because publicly funded traveler information applications have a greater responsibility, compared to proprietary applications, to account for distraction and ensure the safety of its users.