The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Identification of utilities within Iowa Department of Transportation (Iowa DOT) project footprints requires proactive documentation of utility infrastructure within Iowa DOT right-of-way (ROW) based on: 1) A standard for recording utility infrastructure, such as the new ASCE/CI/UESI 75-22 “Standard Guideline for Recording and Exchanging Utility Inf
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Highway ramps are hotspots of truck rollover crashes. Such crashes often block the entire ramp and cause severe congestion. Understanding the major causes of ramp truck rollovers is critical for developing effective countermeasures. This research utilizes drones to collect ramp traffic videos at seven high-risk ramps and develops an Oriented Mask-R
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Public agencies can take a leading role in supporting TOD by making land available to developers (selling or leasing land, potentially below market prices). With existing access to transit systems and often large land areas, park and rides that are publicly owned can be leveraged to support TOD uses, such as affordable housing, office space, small
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The goal of this research study was to provide information and develop tools that can help the Idaho Transportation Department (ITD) conduct safety effectiveness evaluation consistently across the state, provide data-driven rationale for future investments, and to help prepare the evaluation section of the Highway Safety Improvement Program (HSIP)
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Iowa has three classes of public roads: state primary highways, county (secondary) roads, and city streets. Among these, Iowa county roads serve rural Iowa transport needs by assuring a public road connection (i.e., to local access roads) for serving as conduits that channel the flow of people and commodities to and from towns and terminals (i.e.,
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Iowa has three classes of public roads: state primary highways, county (secondary) roads, and city streets. Among these, Iowa county roads serve rural Iowa transport needs by assuring a public road connection (i.e., to local access roads) for serving as conduits that channel the flow of people and commodities to and from towns and terminals (i.e.,
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This study developed a user-friendly tool that allows local agencies to understand the current structural capacities of their pavement assets, prioritize their preservation and rehabilitation needs, and make better-informed pavement infrastructure decisions.
Intersections with roadways are the most dangerous locations along shared use path (SUP) crossings for pedestrians and bicyclists. Despite this, there is limited research on the unique risks of these sites compared to other pedestrian and bicyclist facilities, and limited guidance exists for the geometric and operational characteristics that may ne
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An evaluation was conducted along State Route 60, in Muskingum County, Ohio as associated with ODOT’s construction contract 210208, (PID 101004) to examine the performance differences between traditional temporary traffic signals and Driver Assistance Devices (DADs) at driveways in a work zone. The project consisted of a field and microsimulation a
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The overall goal of this research project is to evaluate performance of the DAD devices in comparison to temporary traffic signal devices and, based on the findings, provide recommendations to ODOT on their safety, effectiveness, and cost-efficiency for adoption in signalized work zones.
Moisture damage in asphalt mixtures can cause early cracking and rutting failures due to the internal damage accumulated by the high internal pore pressures created at the aggregate-binder interface and/or within the binder phase by heavy traffic loads. Due to the high precipitation levels and frequent rain events, distresses originating from moist
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Water is often detrimental to the performance of pavements since it reduces soil strength and modulus and provides sources for erosion and freeze-thaw of base courses and subgrade. A common approach to removing water within pavements is to provide a drainage system, which is effective only when the soil beneath the pavement is saturated or nearly s
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Given the novelty of the Flashing Yellow Arrow (FYA) in Massachusetts, this research study provides MassDOT with a greater understanding of their impacts from an approach-level perspective. More so, this study provides the agency with a holistic overview of infrastructure and operational impacts at each of these intersections, ultimately leading to
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Researchers at the University of California, Davis developed a logistics decision-support tool that facilitates the joint routing of pick-ups and deliveries for cooperating entities to reduce environmental impacts and transport costs. The researchers implemented the tool in several hypothetical case studies to better understand the impact of joint
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Transportation infrastructure systems must resist conditioning from the natural environment and physical demands from service loading to meet the needs of users across the state. Reinforced concrete, which is widely used in bridge decks, pavements, super-and substructures, and other systems, deteriorates under environmental conditioning due to elec
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WYDOT utilizes traditional soil borings, drive point analyses, rock coring methods, and lab investigations to identify and characterize the sub-surface soil. Previous experience with these traditional investigation techniques is good; however, current guidance from FHWA encourages the use on non-traditional investigation techniques. These can inclu
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Roadside revegetation within highway rights-of-way is a final step in road construction, and often occurs in areas that are difficult to reclaim due to harsh climate conditions and impacts of land disturbance, including topsoil removal, soil compaction, and the presence of noxious and invasive weeds. Wyoming Department of Transportation managers ha
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The Virginia Department of Transportation (VDOT) has been working toward the implementation of balanced mix design (BMD) for several years. During that time, special provisions have been developed to address dense-graded surface mixtures with reclaimed asphalt pavement (RAP) contents up to 30% and with RAP contents of 40% and above. In 2020, five f
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To reduce worker injuries in truck mounted attenuator (TMA) crashes, the Missouri Department of Transportation (MoDOT) is piloting a Leader-Follower TMA system, which allows the worker to be removed from the follower vehicle, in two districts. The objectives of this research study are to evaluate MoDOT’s pilot program for Leader-Follower TMAs in tw
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Ensuring the safety of pedestrians and cyclists in rural and small communities is becoming increasingly important as planners seek to encourage active travel and eliminate traffic-related injuries and fatalities, consistent with Vision Zero. One area of focus is the protection of vulnerable road users such as pedestrians, who face a significant ris
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