19 Works

Optimizing Commercial Vehicle Enforcement Investments and Activities to Improve Safety and Increase Revenue Collections

Brian Howell, Jennifer Walton & Andrew Martin
The Kentucky Transportation Cabinet (KYTC) owns and maintains 14 fixed weigh stations for commercial vehicle enforcement. The Kentucky State Police (KSP) is responsible for staffing these facilities to conduct enforcement, while KYTC is responsible for constructing and maintaining these facilities. Like many states, Kentucky has experienced a decline of enforcement personnel to operate weigh stations limiting its ability to conduct inspections for safety enforcement and revenue collection. This study analyzes three CMV facilities for their...

Design MythBusters

Christopher Van Dyke, Steve Waddle & Doug Kreis
When highway project designs depart from design values found in the Kentucky Transportation Cabinet (KYTC) Highway Design Manual and AASHTO’s A Policy on Geometric Design of Highways and Streets, project managers at the agency must obtain either a design exception or design variance. While designers are more comfortable with exceptions and variances than they were 10 or 20 years ago, some hesitancy remains, especially among the Cabinet’s consultants. Misperceptions about what exceptions or variances entail...

KRS and KAR Review of Models as a Legal Contract Document

Bryan Gibson, Pam Clay-Young, Rachel Catchings & Chris Van Dyke
State departments of transportation (DOTs) are expanding the use of electronic engineering data (EED) throughout highway projects — from design and construction through asset management. Included under the umbrella of EED are technologies such as building information modelling (BIM), digital terrain models (DTMs), and 3D models and plan sets. The Kentucky Transportation Cabinet’s (KYTC) Digital Project Delivery (DPD) Initiative is spearheading the transition to EED in the state. While digital delivery promises to streamline project...

Linking Bad Credentials to Safety Issues

Andrew Martin, Jeeyen Koo, Valerie Keathley-Helil, Mallory Brown & Jennifer Walton
This study assesses (1) the effectiveness of the Kentucky Automated Truck Screening (KATS) system, (2) the relationship between credential and vehicle safety violations, (3) the relationship between credential and driver safety violations, and (4) the relationship between credential violations and crashes. The KATS system, which is installed at weigh stations throughout the Commonwealth of Kentucky, is highly effective at detecting KYU, IFTA, and UCR violations with sensitivities of 80.54, 87.56, and 88.28 percent, respectively. However,...

Utilization of Lidar Technology — When to Use It and Why

Levy McIntosh & Brad Rister
Lidar technologies can assist transportation agencies during the design, construction, and maintenance phases of transportation projects. While Lidar has numerous applications, successfully deploying Lidar technologies is only possible if agencies have a solid understanding of their use cases and potential limitations. This report offers guidance the Kentucky Transportation Cabinet (KYTC) can use when making decisions on how to employ Lidar technologies in highway contexts. In addition to reviewing Lidar platforms and comparing Lidar-driven surveying to...

Fill Materials at Integral End Bents

Charlie Sun & Tony Beckham
Jointless bridge designs have become increasingly popular due to their low construction and maintenance costs. But this design carries risks. Most notably, integral end bents can be displaced and undergo settlement due to soil movement in embankments and loads carried by the superstructure. In response, the Kentucky Transportation Cabinet (KYTC) devised a novel treatment for end bent and abutment backfills on low- and middle-span concrete bridges in which elasticized geofoam is placed between geosynthetically confined...

Kentucky Annual Economic Report 2022

Michael W. Clark, James P. Ziliak & Simon Sheather
This report is one of the important ways that the Center for Business and Economic Research fulfills its mission to examine various aspects of Kentucky’s economy as directed by the Kentucky Revised Statutes (KRS 164.738). The analysis and data presented here cover a variety of topics that range from a discussion of Kentucky’s current economic climate to a broad presentation of factors affecting the economy. The report covers numerous dimensions of Kentucky’s economy including the...

2022 Safety Belt Usage Survey in Kentucky

Erin Lammers-Staats, Derek S. Young, Eric Green & Kenneth R. Agent
Each year Kentucky Transportation Center researchers conduct a safety belt usage survey to estimate Kentucky’s statewide safety belt usage rate. In 2022, the safety belt usage rate in Kentucky was 86.72 percent, which represents a 3.06 decline over 2021. Safety belt usage peaked in 2018 at 89.99 percent. Declines in safety belt usage rate over the past couple years may be attributable in part to changes in driver behaviors and traffic dynamics following the COVID-19...

Bridge Project Prioritization

Bryan Gibson, Christopher Van Dyke, Sudhir Palle, Ryan Griffith & Doug Kreis
Kentucky’s 14,000+ bridges are key nodes within the state’s surface transportation network. They facilitate the movement of freight, commercial vehicles, and personal vehicles alike. Historically, the Kentucky Transportation Cabinet (KYTC) has prioritized bridge maintenance projects using sufficiency ratings. These ratings are based on three factors — structural adequacy and safety, design obsolescence, and an asset’s importance within the roadway network. Although useful, sufficiency ratings do not account for factors that should be considered during the...

Non-Nuclear Methods for Compaction Control of Unbound Soil and Granular Layers

Brad Rister, Charlie Sun, Kean H. Ashurst, Jr., Tim Jones & Christopher Van Dyke
In highway construction, the nuclear density gauge (NDG) is the industry standard for measuring soil density and moisture. They are widely used at state transportation agencies, however, because of their reliance on radiation, NDGs are expensive to maintain and have unique storage requirements. Operators must also earn specialized certifications and adhere to rigorous safety protocols. Equipment manufacturers have developed several non-nuclear density gauges which are more user friendly, however, their accuracy has sometimes not equaled...

Assessment of Deteriorated Structural Concrete to Provide Durable Repairs

Theodore Hopwood, Christopher Goff & Sudhir Palle
© 2021 University of Kentucky, Kentucky Transportation Center Report Number: KTC-21-32/SPR15-505-1F

Electric Vehicles: Analysis of Revenue Issues and Charging Station Implementation Plans

Chris Van Dyke, Bryan Gibson, Ryan Griffith, Andrew Martin, Jeeyen Koo & Doug Kreis
© 2021 University of Kentucky, Kentucky Transportation Center Report Number: KTC-22-02/KHIT147-1F

Integration of Utility Engineering, Coordination, and Highway Design

Tim Taylor, Roy Sturgill, Kenny Franklin, Shani A. Montes Victorio & Gabi Dadi
State transportation agencies (STAs) strive to deliver highway projects on time and on budget. Utility relocations are frequently cited as a primary reason for delays. This report describes a new approach for enhancing the alignment of utility coordination and design. Researchers crafted this new approach based on the findings of a literature review, an evaluation of how utility coordination milestones and project development milestones are currently aligned at the Kentucky Transportation Cabinet (KYTC), and the...

Updating the Bridge Construction Cost Database

Rachel Catchings, Ying Li, Ryan Griffith & Sudhir Palle
Adopting a comprehensive suite of methods to track, analyze, and maintain data on bridge construction costs can help state transportation agencies identify and implement strategies to mitigate the influence of factors which escalate project costs. This report discusses how the Kentucky Transportation Cabinet (KYTC) should approach updating, maintaining, and analyzing its bridge construction cost data. Based on a review of practices introduced at other agencies and interviews with public and private industry stakeholders, the report...

Linking Bad Credentials to Safety Issues

Andrew Martin
This study assesses (1) the effectiveness of the Kentucky Automated Truck Screening (KATS) system, (2) the relationship between credential and vehicle safety violations, (3) the relationship between credential and driver safety violations, and (4) the relationship between credential violations and crashes. The KATS system, which is installed at weigh stations throughout the Commonwealth of Kentucky, is highly effective at detecting KYU, IFTA, and UCR violations with sensitivities of 80.54, 87.56, and 88.28 percent, respectively. However,...

Updating Congestion Performance Measures for SHIFT 2022

Mei Chen, Xu Zhang, Eugene Antwi Boasiako & Fahmida Rahman
Executive Summary The Kentucky Transportation Cabinet (KYTC) has adopted a data-driven decision-making process to allocate funds for highway improvement projects. This process — Strategic Highway Investment Formula for Tomorrow (SHIFT) — requires that candidate projects be scored on five critical metrics: safety, asset management, congestion, economic growth, and benefit/cost analysis. The congestion metric is vehicle hours of delay (VHD), which was first developed for the SHIFT 2020 cycle (1). For SHIFT 2022, VHD is estimated...

Evaluation of Manual Infrared Brake Screening Technologies

Joseph Crabtree, Brian Beaven & Jennifer Walton
The purpose of this project was to install and operate two manual infrared (IR) brake screening systems at Kentucky inspection facilities to enhance the quality of Level 1 safety inspections. A radio button in the inspection software allowed enforcement personnel to indicate when the IR equipment was used to select a truck for inspection. This feature allowed a direct comparison of performance measures (e.g., number of violations identified per inspection, out-of-service rate, etc.) for IR-generated...

Specialized Safety Training and Tracking for KYTC Construction and Maintenance Personnel

Gabriel Dadi, Ashtarout Ammar, Seth Atkins & Martha Horseman
High-quality safety training is critical for educating employees in the highway construction and maintenance industry about workplace hazards and giving them tools to remove and/or minimize associated risks. But researchers and state transportation agencies have not committed enough resources to develop safety trainings that address the unique needs of this sector. This report fills in this gap for the Kentucky Transportation Cabinet (KYTC) by cataloguing safety training resources available through other state and federal transportation...

Combined Behavioral and Engineering Approach to Preventing Highway Fatalities

Benjamin Blandford, Reginald Souleyrette, Caitlin N. Pope, Tony Fields & Erin Lammers-Staats
Traditional, single-discipline highway safety approaches can be augmented through multidisciplinary approaches that consider both engineering and behavioral interventions (e.g., education, enforcement, public outreach campaigns). Leveraging a systems-based conceptual framework of roadway safety, multiple forms of statistical and geospatial analysis, and SPF modeling and network screening, this report proposes and demonstrates methods for unpacking the influence of behavioral-related factors on crash occurrences and outcomes. The primary focus is on behaviors targeted in the Strategic Highway Safety...

Registration Year

  • 2022

Resource Types

  • Report


  • University of Kentucky
  • Iowa State University