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DOT Practices on Road Safety Audits
3/8/2024 8:00:47 PM
One tool utilized by some departments of transportation (DOTs) to improve safety performance is conducting road safety audits (RSAs), also known as “road safety assessments.” An RSA is a formal evaluation of the safety performance of an existing or future highway segment or intersection performed by an independent, multidisciplinary team. NCHRP Synthesis 615: DOT Practices on Road Safety Audits , from TRB's National Cooperative Highway Research Program, seeks to address the need for more knowledge regard...
Advancing Gender Equity in the DOT Workforce
3/8/2024 8:00:14 PM
Women comprise only 15 percent of the transportation workforce, and this statistic declines in executive and leadership positions and does not reflect those who may not identify as men or women. For women of color, the numbers are even more disparate. NCHRP Synthesis 618: Advancing Gender Equity in the DOT Workforce , from TRB's National Cooperative Highway Research Program, documents current state departments of transportation (DOT) practices related to advancing gender equity in DOT workforces.
Prevention and Mitigation of Surficial Slope Failures on Fill Highway Embankment Slopes
3/7/2024 8:00:49 PM
Surficial slope failures in highway fill embankments are shallow landslides that occur within the embankment fill, usually affecting only a portion of the slope’s height. These failures tend to occur after a vulnerable embankment slope is subjected to a triggering event. An embankment’s failure susceptibility generally depends on factors such as slope steepness, material composition, and ability to withstand adverse drainage conditions. Examples of trigger mechanisms include intense rainfall, snowmelt, s...
Outsourcing Post-Construction Stormwater Best Management Practice Inspection and Maintenance Activities
2/7/2024 2:00:39 PM
Post-construction stormwater best management practices (BMPs) are designed to reduce the amount of stormwater runoff, prevent erosion, and improve water quality by removing pollutants from stormwater. NCHRP Synthesis 614: Outsourcing Post-Construction Stormwater Best Management Practice Inspection and Maintenance Activities , from TRB's National Cooperative Highway Research Program, documents state department of transportation practices related to outsourcing post-construction stormwater BMP inspection a...
Moisture Measurement for Pavement Foundations and Slopes
10/19/2023 3:00:07 PM
Accurate and timely moisture measurement of soils, aggregates, and recycled materials is critical to properly compacting these materials. There are numerous methods for measuring the moisture content of the soil; some are laboratory-based, and some are done in-situ. NCHRP Synthesis 612: Moisture Measurement for Pavement Foundations and Slopes , from TRB's National Cooperative Highway Research Program, documents state department of transportation (DOT) practices for field and laboratory moisture measureme...
Contrast Pavement Markings Practices
10/5/2023 6:00:43 PM
Contrast pavement markings (CPM) improve the visibility of pavement markings by providing better contrast with the pavement surface, especially on lighter-colored pavements. NCHRP Synthesis 613: Contrast Pavement Markings Practices , from TRB's National Cooperative Highway Research Program, documents current CPM practice by state departments of transportation.
Use of Probe Data for Freight Planning and Operations
9/14/2023 5:00:59 PM
As freight transportation volumes have grown rapidly—further spurred by pandemic-driven e-commerce growth—state departments of transportation (DOTs) have become increasingly reliant on probe data to monitor freight infrastructure performance, manage demand, and understand freight infrastructure needs. NCHRP Synthesis 611: Use of Probe Data for Freight Planning and Operations , from TRB's National Cooperative Highway Research Program, documents current state DOT practices regarding the use of probe data i...
Critical Findings for Tunnel Functional Systems
8/23/2023 7:00:48 PM
Road tunnels employ a multitude of functional systems that include a variety of equipment: lighting, ventilation, power supply, fire protection systems such as fixed fire-fighting systems, fire detection systems, communications systems and operational devices, supervisory control and data acquisition, closed circuit television, variable message signs, and radio. Maintenance of these systems is critical to the operation of the tunnel and to the overall roadway network. NCHRP Synthesis 607: Critical Findin...
Practices to Motivate Safe Behaviors with Highway Construction and Maintenance Crews
7/19/2023 6:00:28 PM
In comparable private sectors, incentive and disincentive programs have effectively promoted safe behaviors by employees. However, state departments of transportation (DOTs) have unique limitations and restrictions on their ability to financially incentivize safe actions by highway construction and maintenance crews or, in some cases, implement corrective actions to disincentivize unsafe actions. While navigating these restrictions is difficult, some DOTs have implemented unique approaches in order to in...
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