Access Management Best Practices

Research has persistently demonstrated that adopting a systematic access management framework improves highway operations and bolsters safety. Many state transportation agencies have adopted formal access management programs to systematize the application of access management techniques, however, the Kentucky Transportation Cabinet (KYTC) been unable to institute such a program due to institutional, regulatory, and political constraints. Recognizing the benefits of judicious access management, the Cabinet asked researchers at the Kentucky Transportation Center (KTC) to identify access management best practices that are effective, can be easily implemented, and are compatible with existing statutes and regulations. After reviewing national-level and state-level guidance on access management, researchers devised an Access Management Toolbox which contains 14 commonly used access management techniques. Using a rating scale of 1 to 5, personnel at KYTC were then asked to rate each technique in terms of its effectiveness and ease of implementation (1 = ineffective and/or difficult to implement; 5 = highly effective and/or easy to adopt). Six techniques garnered scores of 4 or above for both effectiveness and implementation: 1) maintaining sight distance, 2) setting the maximum number of driveways per lot, 3) installing auxiliary turn lanes, 4) protecting the functional area of intersections, 5) adopting turn restrictions, and 6) conducting traffic impact studies. Consistently incorporating these access management techniques into permitting, planning, and design activities will result in the development of an efficient and safe highway system that equitably balances the needs of motorists and property owners

Economic and Environmental Benefits of a Reduced Roadside Mowing Program for Kentucky Highways

A growing number of state departments of transportation (DOTs) are introducing conservation mowing programs that aim to reduce the frequency of roadside mowing while expanding the footprint of pollinator habitat. Wanting to get a better handle on the utility conservation mowing, the Kentucky Transportation Cabinet (KYTC) funded this study to explore the economic and environmental benefits that accrue from mowing less often. This report presents a synthesis of best conservation mowing practices based on a review of landscape management policies, programs, and procedures in use at 15 state DOTs. Most agencies divide the roadside into discrete management zones. While they continue to mow regularly in the areas closest to roadways (extending roughly 15 feet or so from the edge of the shoulder), beyond this mowing is done less often and is combined with selective herbicide use to facilitate plant species favored by pollinators. Regardless of the mowing strategy adopted, vehicle safety must be preserved by maintaining adequate clear zones and sight distances. An economic analysis of different mowing strategies found that KYTC can save between $9 million and$24 million over a five-year period through mowing cutbacks. Eliminating a single litter cycle can generate an additional $5 million in savings over the same period. To facilitate communication with the public, a proof-of-concept marketing document is put forward which explains to the driving public how KYTC is adjusting its landscape management practices. Dubbed Kentucky’s Buzzing!, the goal is to provide the public with readily understood explanations of why pollinators matter and how the Cabinet can improve their fortunes through conservation mowing

KRS and KAR Review of Models as a Legal Contract Document

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 development and management it does not come without hurdles. This report discusses methods for agency wide implementation of EED and highlights best practices for managing, communicating, and storing data as well as the potential legal ramifications of using 3D models as contract documents. While no state or federal laws preclude the use of EED as contract documents, as KYTC adopts paperless plan sets it must (1) perform its due diligence to ensure all processes comply with relevant statutes and regulations, (2) develop guidance for managing EED and transmitting records to external parties, (3) put clear guidelines into place for creating and preserving records, and (4) partner with internal and external stakeholders to facilitate the rollout of digital delivery

2+1 Roadway Design Guidance Update

The frequency and severity of crashes on rural two-lane roadways have increased in the US relative to other road types. This trend can be explained by the growing number of vehicles, higher speeds, narrow shoulders, and vehicle mixes. One solution for improving traffic flow and safety outcomes on rural two-lane roadways is to adopt a 2+1 design, which confers the benefits of four-lane highways but at a lower cost. Transportation agencies throughout Europe — and increasingly the US — have seen good results from 2+1 layouts. Crash data from Sweden, Germany, Finland, and Denmark reveal better safety outcomes following the implementation of 2+1 designs, with reductions in fatal and fatal and injury crash rates of 25 – 80 percent. Studies in the United States have found crash declines of 35 – 44 percent following the transition to 2+1 layouts. Over the past 10 years, the Kentucky Transportation Cabinet (KYTC) has built several 2+1 roadways. Evaluations of three 2+1 segments in the state found lower crash rates on two segments, however, not enough crash data are available to draw definitive conclusions. Despite this lack of confirmatory data, there is consensus among practitioners that 2+1 designs hold considerable promise for improving rural roadway operations. Building off of 2+1 guidance originally issued by KYTC in 2013, this report outlines updated policies that account for lessons learned at the agency during the design and construction of 2+1 roadways as well as best practices adopted by other states

Best Practices for Performance Measurement in Transportation Operations and Maintenance

Public agencies benefit from measuring their performance as it helps to focus employee and organizational activities. State departments of transportation have become more performance-oriented over the past two decades and routinely collect data on highway safety, infrastructure condition, system operations, project delivery, winter maintenance, transit, bicycle and pedestrian facilities, and customer service. While the Kentucky Transportation Cabinet (KYTC) use performance measures in a variety of areas, the agency wants to adopt new metrics related to mobility and the responsiveness of maintenance operations. This report documents performance measurement strategies used at state transportation agencies throughout the country and proposes new performance measures in these areas for KYTC. Among the performance measures put forward to the Cabinet, the following ones ranked most highly: (1) response times for complaints and potholes, (2) contract response time, (3) percentage of time and money spent on routine and emergency maintenance of drainage, guardrail, and cable median barriers, (4) response time to repair guardrail and cable median barriers, and (5) winter maintenance operations. As KYTC further integrates performance measures into its operations, it is critical to clearly communicate performance information to the public using tools such as online dashboards and reports

Training Curricula for the Kentucky Transportation Cabinet Department of Highways

Most state departments of transportation (DOTs) offer their employees professional development opportunities (e.g., training courses) so they can build their expertise and in doing so facilitate agency efforts to fulfill their business mandates. The Kentucky Transportation Cabinet (KYTC) is no different in this regard. While professional development opportunities are invaluable, and while the Cabinet offers a number of trainings to its staff, currently there exists no comprehensive training curricula to help professionals and paraprofessionals systematically grow their knowledge and skills and ensure KYTC maintains a robust portfolio of technical competencies across the organization. The inconsistent and ad hoc manner in which trainings are made available in turn produces unevenness in the distribution of knowledge and skills across the Cabinet. To address the challenge, researchers at the Kentucky Transportation Center (KTC) were asked to develop training curricula for different subject-matter areas. Before devising these curricula, researchers examined practices and programs in place at other state DOTs which are designed to improve professional development as well as the trainings currently available from at or through the Cabinet. Additionally, previous course offerings and attendance figures were analyzed to understand which trainings have proven the most valuable. Based on these analyses, researchers prepared training curricula for five categories: construction, maintenance, roadway design, project management, and section engineers. Within each category, curricula identify training opportunities for personnel classified as entry, mid-level, and advanced. Undoubtedly, the curricula outlined in this report serve only as a starting point; they will need to undergo refinement as the needs of both KYTC and its employees continue to evolve

2020 Kentucky Transportation Cabinet Maintenance Customer Survey

The Kentucky Transportation Cabinet (KYTC) periodically surveys drivers to understand their perceptions of the agency’s maintenance activities. In 2020, Quadratics in conjunction with the Kentucky Transportation Center surveyed 2,400 licensed drivers throughout the state to gauge their perceptions of highway maintenance, identify areas of strength and weakness, and discern how drivers obtain information on traffic and weather conditions. Survey participants answered questions about five areas of highway maintenance — roadside features, pavement surfaces, shoulders, drainage, and signs/markings. Drivers reported being most satisfied with the maintenance of signs, guardrail, and striping. Pavement surfaces, potholes, and overall appearance garnered the lowest ratings. When queried about investment priorities, respondents said the most important areas for KYTC to focus on are pavement surfaces, signs, and markings. A comparison of the 2010, 2016, and 2020 customer maintenance surveys found that responses and reported levels of satisfaction have remained largely consistent. Questions about traffic and weather information revealed that drivers are increasingly reliant on smartphone apps while traditional media (e.g., television, radio) have diminished in importance

Evaluating the Safety Cultures of Kentucky Transportation Cabinet Maintenance Crews

Highway work zones can be dangerous and unpredictable. Between 2003 and 2017, over 1,800 workers died on road construction sites. Eliminating injuries and deaths requires state transportation agencies to adopt robust safety cultures as there is a clear relationship between these cultures and worker behaviors. The Kentucky Transportation Cabinet (KYTC) is committed to improving safety performance by nurturing a positive safety climate among highway maintenance crews. To understand the safety cultures of KYTC maintenance crews, researchers administered a survey based on the Safety Climate Assessment Tool (S-CAT) developed by the Center for Construction Research and Training (CPWR). This is the first tool developed for the construction industry. The survey was used to quantified the existing safety climate and evaluate how effective safety programs and controls are at reducing workplace hazards. Survey respondents answered questions on 37 indicators across eight safety climate categories: employee risk perception, management commitment, aligning and integrating safety as a value, ensuring accountability at all levels, improving supervisory leadership, empowering and involving employees, improving communication, and safety training. For each indicator respondents assigned a rating on a five-point Likert scale — Inattentive (1), Reactive (2), Compliant (3), Proactive (4), Exemplary (5). Analysis of survey responses at the statewide and district levels found that KYTC’s safety culture can be characterized as between compliant and proactive. Focus groups with maintenance superintendents generated recommendations to improve safety cultures and install multiple layers of preventive measures to further reduce the number and threat of jobsite hazards

Analysis of Truck Weight Limit Regulations

In the United States vehicle weight limits are set by laws and regulations enacted at the state and federal levels. On interstates the maximum allowable gross vehicle weight is 80,000 lbs. States use different rules for permitting overdimensional and overweight (OD/OW) vehicles, and most have carve outs that exempt specific commodities from standard weight limits. This results in a complex legal and regulatory landscape that enforcement personnel can find difficult to negotiate. This report discusses strategies that can be adopted in the state of Kentucky to improve enforcement and mitigate infrastructure damage caused by OD/OW loads. After presenting a thorough review of laws pertaining to vehicle weight limits at the national and state levels, the report presents the results of a nationwide survey administered to agency staff directly involved in weight limit enforcement. Survey respondents reported that OW trucks inflict a disproportionate amount of damage on pavements and bridges that permitting fees and fuel taxes are insufficient to ameliorate roadway damage caused by these vehicles, and that commodity exemptions and staff shortages make enforcement a challenging proposition. In addition to sharing many of the opinions of agency staff elsewhere, Kentucky personnel said that many bridges and roadways are not designed to withstand repeated loads of 80,000 lbs. of gross vehicle weight, heavier vehicles with commodity exemptions are especially damaging to collector and local roads, and that enforcement efforts need to be redoubled. Recommendations for improving weight limit enforcement in Kentucky cover areas such as legislation (e.g., reducing the number of commodity exemptions, using axle-based weight limits), highway design, enforcement and judicial practices, and permitting and fees. Implementing these recommendations can help Kentucky modernize and standardize its enforcement efforts