A total of 1,062 left-turn related crashes at signalized intersections in Idaho (2006-2015) were analyzed to document the underlying factors that affect left-turn crashes and to identify crash types that prevail among different driver groups. Comparative analysis was conducted to compare the characteristics of intersections ...

Over five million traffic crashes are reported annually in the United States, and the documentation process for every single crash begins at the scene of the incident with information gathered by a member of the law enforcement community or by a private citizen (NHTSA). This information is subsequently transmitted to a local ...

This research focused on the use of equipment telematics, sensor analytics, and virtual modeling to positively impact construction sites by providing real-time field of view monitoring of the worker-on-foot and by automating safety warnings on the work site. The automation of safety warnings will allow an alert to be delivered ...

Formation factor of fresh cementitious pastes was investigated experimentally as a function of time from initial mixing and mixture design properties such as supplementary cementitious material (SCM) replacement level, water-to-binder ratio (w/cm), and superplasticizer dosage. SCM types included fly ash, slag and silica fume. ...

In this study, three different pavement marking material types were evaluated by using a British Pendulum Tester (BPT) in dry, wet, and icy conditions. The frictional properties were recorded as a British Pendulum Number (BPN). Two different rubber sliders on the BPN were used to compare different pavement marking users: a ...

A significant number of local highway jurisdictions in Idaho lack the engineering expertise and financial resources to conduct detailed assessments when requests are received to increase weight allowances for local roadways beyond the current legal limit for gross load weight of 80,000 pounds. Idaho Code 49-1004A (1) states ...

Remote weather information systems (RWIS) are an important part of determining maintenance activities and scheduling. However, the cost of RWIS limits the number of systems that can be deployed. Because of the lack of power and the high power budget of commonly used systems, some locations are not suitable for RWIS even though ...

Recent advancements in data collection capabilities have allowed transportation-related agencies to collect mountains of safety data. There is an immediate need to find out what types of safety data are being collected, what types of safety analysis can be done with the collected data, and what (other) types of safety data ...

This research extended models for predicting current crash counts by severity (CCS) by developing a two-stage regression model and a generalized nonlinear regression model for formulating a new method for identifying CCS-based hotspots. The hotspot identification (HSID) method is designed to improve the safety performance ...

Deep foundations may need to resist torsional loads resulting from wind loading on traffic sign and signal pole structures, or seismic loading on curved or skewed bridges. Although methods for designing deep foundations at the ultimate limit states are readily available, and their accuracy has been quantified for selected ...