Milan Zlatkovic

University of Wyoming | UW · Department of Civil and Architectural Engineering and Construction Management

Motorcycle riders and passengers are much more likely to be killed or severely injured in a crash, and on average about 15 percent of all traffic fatalities include motorcyclists. The study uses 12 years of motorcycle crash data (2008-2019) from Wyoming on crash, vehicle and person levels, and applies multinomial logistic and Bayesian regression mo...

In this study, the operational performance of the joint deployment of Connected Vehicles (CVs) and Continuous Flow Intersections (CFIs) is evaluated in a simulation environment built using VISSIM. The operational effect of various Market Penetration Rates (MPRs) of CVs at full and partial CFIs is studied. CV communication protocols that help exchan...

This study evaluates the mobility impact of implementing Connected Vehicle (CV) technology at the Conventional Diamond Interchange (CDI), Diverging Diamond Interchange (DDI), and Single Point Diamond Interchange (SPDI). The evaluation is based on a microsimulation environment created in VISSIM combined with ASC/3 Software-in-the-Loop signal control...

Motorcycle riders and passengers are much more likely to be killed or severely injured in a crash, and on average, about 15% of all traffic fatalities include motorcyclists. The study uses 12 years of motorcycle crash data (2008–2019) from Wyoming, and eight years of data from Utah (2014–2021) and applies multinomial logistic and Bayesian multileve...

In this study, the safety impact of the coupled implementation of signal coordination and connected vehicles (CVs) is examined in a microsimulation environment created in VISSIM. The Surrogate Safety Assessment Model (SSAM) was implemented to generate results of surrogate safety measures. The findings provided evidence that CVs can improve the safe...

Emerging high-resolution datasets allow for developing traffic signal performance measures (TSPMs) which can provide a better understanding of traffic signal operations. One of the specific objectives of signal operations is related to the measurement of capacity utilization. A fundamental measure for capacity utilization is the ‘‘degree of saturat...

Motorcycle riders and passengers are much more likely to be killed or severely injured in a crash, and on average about 15% of all traffic fatalities include motorcyclists. Between 2008 and 2019, the average motorcycle crash frequency in Wyoming was 286 crashes/year, 17 of those being fatal. This paper assesses injury severity of motorcycle-related...

This study proposes and investigates the safety performance of a new innovative interchange design, called the continuous green T-partial cloverleaf A (CGT-parclo A). The CGT-parclo A was compared with various other conventional and unconventional service interchange designs. To address the objectives of this research, a simulation modeling network...

For the last decade, disaggregate modeling approach has been frequently practiced to analyze truck-involved crash injury severity. This included truck-involved crashes based on single and multi-vehicles, rural and urban locations, time of day variations, roadway classification, lighting, and weather conditions. However, analyzing commercial truck d...

This paper develops CV based algorithms which use transit vehicle speed and the estimated time that the vehicle needs to arrive at an intersection to trigger Transit Signal Priority (TSP) initiation. This information is updated each second based on the traffic conditions such as speed, a current distance of a transit vehicle to the intersection, an...

Connected Vehicles (CV) are an emerging technology with a large potential to improve traffic operations and safety. This paper develops and tests advanced CV-based multi-level conditional Transit Signal Priority (TSP). The algorithms are using the latitude/longitude (lat/lon) coordinates of CV vehicles and intersections to establish communication,...

Connected vehicle (CV) systems are at the core of intelligent transportation systems (ITS) for their capability to support a variety of ITS applications and to unite vehicles and infrastructure elements into a well-integrated transportation system. CV refers to vehicles that exchange information with each other and with the infrastructure. The queu...

The disaggregate modeling approach is a new trend in the literature to analyze the injury severity of truck-involved crashes. The assessment of truck driver injury severity based on driver action is still missing in the literature. This paper presents an extensive exploratory analysis that highlights significant variability in the severity of truck...

In combination with challenging geometrical characteristics and environmental conditions, heavy truck traffic along interstate 80 (I-80) in Wyoming often creates operational and safety issues. One of the potentially effective countermeasures that can improve traffic conditions along vertical grade sections is the installation of climbing lanes. Thi...

This paper investigates the significant contributing factors affecting the injury severity of car drivers, car passengers, and truck occupants from the aspects of car-truck collisions along interstate 80 (I-80) in Wyoming using a binary logit model with a Bayesian inference approach. Fixed- and random-effects models were developed to examine the ef...

Transportation agencies are facing problems of inadequate capacities to meet growing traffic demand. Street widening, signal operations optimization, innovative designs and multimodal transportation modes are traffic management strategies that can improve traffic operations along congested corridors. The goal of this paper is to assess future 2040...

This study explores the safety and operational performance along I-80, with a focus on the benefits of climbing lanes along steep grades.

Wyoming is encountering an extensive increase in truck movement along Interstate 80 (I-80). The increased interactions between trucks and other vehicles have raised many operational and safety concerns. This paper presents an operational analysis of freeway climbing lanes under heavy truck traffic, which extends to a benefit-cost analysis from both...

Wyoming is encountering an extensive increase in truck movement along Interstate 80 (I-80). The increased interactions between trucks and other vehicles have raised many operational and safety concerns. This paper presents an operational analysis of freeway climbing lanes under heavy truck traffic, which extends to a benefit-cost analysis from both...

As traffic congestion increases day by day, it becomes necessary to improve the existing roadway facilities to maintain satisfactory operational and safety performances. New vehicle technologies, such as Connected and Autonomous Vehicles (CAV) have a potential to significantly improve transportation systems. Using the advantages of CAVs, this study...

The State of Wyoming road network is characterized by heavy truck traffic. In 2015, truck traffic was approximately 22% of vehicle miles traveled (VMTs) along all routes in Wyoming, according to the WYDOT Annual Traffic Report. The heaviest truck traffic exists along I-80 with about 47% truck VMTs. Trucks have significantly different physical and d...

Over recent years, the United States has encountered steady development in the amount of freight transported by truck because of globalization, trade growth, and improvements in logistics and supply chain management. Wyoming is also encountering an extensive increase in truck movement along Interstate 80 (I-80). The increased interactions between t...

The State of Wyoming is experiencing a high percentage of truck traffic along all highways, especially Interstate 80 (I-80), because of an expansion in oil and gas production. The increased interactions between trucks and other vehicles have raised many operational and safety concerns along I-80. This paper shows an operational analysis of a ten-mi...

The State of Wyoming experiences a high percentage of truck traffic along all its highways, especially Interstate 80 (I-80). The increased interactions between trucks and other vehicles have raised many operational and safety concerns. This paper presents a safety analysis and a development of safety performance functions (SPFs) along I-80, with a...

The State of Wyoming is characterized by heavy truck traffic flow, especially along Interstate 80 (I-80). A large portion of I-80 in Wyoming goes through mountainous and rolling terrain, resulting in significant vertical grades. About 9% of I-80 in each direction is within vertical grades of more than 3%, with certain sections reaching grades of cl...

Over recent years, the United States has encountered steady development in the amount of freight transported by truck because of globalization, trade growth, and improvements in logistics and supply chain management. Wyoming is also encountering an extensive increase in truck movement along Interstate 80 (I-80). The increased interactions between t...

The State of Wyoming is experiencing a high percentage of truck traffic along all highways, especially Interstate 80 (I-80). The increased interactions between trucks and other vehicles have raised many operational and safety concerns. This paper presents a safety analysis and a development of Safety Performance Functions (SPF) along I-80, with a f...

The need for multimodal transportation alternatives in metropolitan areas is increasing because of the inability to build more capacities for low-occupancy vehicles. This paper describes multimodal alternative analysis and comparisons of potential improvements. The alternatives include Bus Rapid Transit (BRT), addition of bicycle lanes, implementat...

Street connectivity measures the density of networks and directness of paths. Increasing street connectivity is one of the ways to increase network capacities, achieve a better distribution of traffic flows, improve accessibility and encourage the use of non-motorized traffic modes. This paper analyzes the effects of enhanced street connectivity on...

Innovative intersections are defined as any at-grade design concepts that are able to reduce the number of signal phases at the main intersection. The Continuous Flow Intersection (CFI) displaces the left turns from the main intersection approach using an additional upstream crossover, allowing the left turns to run concurrently with the through mo...

Agencies that have large-scale traffic signal systems under their purview often have to face asset upgrade decisions. As one of the most advanced traffic control technologies, Adaptive Traffic Control Systems (ATCS) are among the options that must be taken into consideration. Having in mind the complexity of benefits and costs stemming from ATCS in...

Most previous evaluation studies of various signal control strategies, both in the field and through microsimulation, used common traffic performance measures (PMs) related to travel times, number of stops, control delay, etc.. Recent advancements in detection and controller data-logging capabilities have brought forth new types of signal PMs. Two...

Transportation and planning agencies in the Salt Lake City region have recognized the need for multimodal transportation that would facilitate all transportation modes, and have begun working together towards achieving this common goal through increasing capacities, implementing innovative solutions and designing with all system users in mind. Some...

When adaptive traffic control systems are deployed in the field, agencies install them for one of two reasons: (i) to cope with day-to-day traffic fluctuations and/or (ii) to address frequent but sudden cases with special traffic (incidents, inclement weather etc.). There is an ongoing debate among researchers in which of these two cases adaptive s...

GPS-based transit signal priority (TSP) has advantages in providing flexible and conditional signal priority to transit vehicles. This study compared the effectiveness of different combinations of operational patterns and TSP strategies and assessed their impacts on side-street traffic operations. Micro-simulation analytical tools were applied to t...

Developing optimal traffic control for multimodal operations is more challenging than ever before. While traffic demand for private cars continually grows, the impact of multimodal users increases the complexity of finding good signal control solutions for the urban traffic environment. One of the major issues is how to develop 'equity' in signal c...

1 Most of the previous evaluation studies, either in the field or through microsimulation, used 2 common traffic performance measures (PMs) related to travel times, number of stops, control 3 delay, etc. to evaluate various traffic signal control strategies. Recent advancements in detection 4 and controller data-logging capabilities have brought ne...

GPS-based transit signal priority (TSP) is a new type of transit preferential tool being considered in many North American cities. With GPS detection and advanced communications, GPS-based TSP provides flexible and conditional signal priority to transit vehicles. This is a relatively new system with limited field implementations and evaluations. Th...

Highly connected street networks increase accessibility for multimodal transport, but their effects on the efficiency of still-dominant vehicular traffic is rarely addressed. As interest increases in transforming typical suburban developments from car-oriented to multimodal environments, the effects of redesigned street networks in the period befor...

This study compares InSync adaptive traffic control system to three conventional Time-Of-Day signal timing plans in a microsimulation environment. It investigates a comprehensive set of performance measures by evaluating performance of InSync on a 12-intersection corridor along SR 421 in Volusia County, FL for different operational scenarios. The V...

In 2012, the Utah Department of Transportation (DOT) implemented a performance-based warranty on a portion of an 1-15 pavement marking project. The awarded contract requested a contractor warranty on the implemented markings for a total of 6 years. This contract represented the first time that the Utah DOT had requested a warranty on pavement marki...

Adaptive Traffic Control Systems have been evaluated many times in the past, showing relative success over the conventional Time-Of-Day signal timing plans. Most of the previous evaluation studies, either in field or through microsimulation, used common traffic performance measures related to travel times, number of stops, control delay, etc. Recen...

Prepared in cooperation with the Utah Department of Transportation. 16. Abstract Traffic congestion mitigation is one of the key challenges that transportation planners and operations engineers face when planning for construction and maintenance activities. There is a wide variety of approaches and methods that address work zone impacts, starting w...

Accessibility emerges as the transportation performance measure that emphasizes the benefits to transportation system users and captures more than the speed of travel. Transit accessibility shows how easy it is for an individual to travel to a desired destination by using public transit. However, for transit to be considered as an option in mode ch...

This paper presents an integrated framework for effective coupling of a signal timing estimation model and dynamic traffic assignment (DTA) in feedback loops. There are many challenges in effectively integrating signal timing tools with DTA software systems, such as data availability, exchange format, and system coupling. In this research, a tight...

The goal of this article is to estimate and analyze the impact of Light Rail Transit (LRT) Transit Signal Priority (TSP) on other modes of transportation and the performance of a transportation network using microsimulation environment. It is anticipated that an expected increase in frequency of LRT trains, due to the implementation of an additiona...

Innovative intersections are designed with dislocated left turn movements and reduced number of traffic signal phases in order to increase the capacity and reduce the number of conflict points. These intersections are considered as alternative designs in the future Transit Oriented Development (TOD) location in West Valley City, Utah, in order to r...

Light Rail Transit (LRT) has been operating successfully in Salt Lake Valley for fifteen years, with a constant system expansion and increase in ridership. When the first LRT initially opened in 1999, it provided service along a 16-mile corridor between Sandy and downtown Salt Lake City. In 2001, the line was extended to the University of Utah and...

Accessibility emerges as the transportation performance measure that emphasizes the benefits of the transportation system users, capturing more than the speed of travel. Transit accessibility shows how easy it is for an individual to travel to a desired destination using public transit. However, in order for transit to be considered as an option in...

This paper presents an analysis of different transit signal priorities (TSPs) for a future bus rapid transit (BRT) corridor in West Valley City, Utah. The goal was to find the optimal TSP strategy for estimated and planned traffic and transit operations. The study used VISSIM microsimulation software in combination with ASC/3 software-in-the-loop s...

The goal of this study was the development and evaluation of an algorithm for resolving conflicting requests for transit signal priority (TSP). This algorithm was designed to work with actual traffic controllers without the need for new hardware or software installations. The algorithm was tested in VISSIM microsimulation and ASC/3 software-in-the-...

The goal of this paper is to assess the operational implementation of strategies for predictive light rail priority through microsimulation. A 2-mi corridor in Salt Lake County, Utah, where the University Line of light rail line operates, was studied. The study used VISSIM microsimulation models to analyze light rail operations and the effects that...

This paper presents an application of the ASC/3 Software-in-the-Loop (SIL) simulation in Transit Signal Priority (TSP) implementation and analysis. Two options of the ASC/3 controller software were examined: built-in TSP features, and the controller logic processor as a means to develop custom-defined Predictive Priority Strategies (PPS). The study...

Bus rapid transit (BRT) is becoming one of the most popular transit services in the USA. A total of 106 miles of BRT service is scheduled for deployment in the State of Utah in future years. This research looked at the first BRT deployment in West Valley City, Salt Lake County, Utah. The 10.8 miles long BRT line was launched on July 14, 2008, and s...

In recent years, traffic simulation software packages have become powerful tools in developing and studying the impacts of different traffic scenarios. This study presents a use of the VISSIM traffic simulation software in evaluating Transit Signal Priority (TSP) strategies using two types of emulated signal controllers: the Ring Barrier Controller...

Currently, there are three different methods to model traffic signal operations in microscopic simulation models: the simulation model's controller emulator, hardware-in-the-loop simulation, and software-in-the-loop simulation. Although all three methods can be based on the same industry standard code, their different implementations suggest potent...

Disclaimer: The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the information presented. This document is disseminated under the sponsorship of the Department of Transportation, University Transportation Centers Program, in the interest of information exchange. The U.S. Government as...