Lundi, 17 Août, 2020 - 14:00
Since Kentucky’s initial rumble strip designs were adopted, there has been additional research and experimentation in other states with alternative designs as a response to complaints from the public about noise pollution caused by rumble strips. The new research indicates that other rumble strip designs might provide increased interior noise/vibration...
Lundi, 17 Août, 2020 - 14:00
This research report documents a proposed process to evaluate roadsides risk for inclusion into Austroads' Guide to Road Design Part 6: Roadside Design, Safety and Barriers. The report provides background information about the proposed guidance. The guidance for evaluating roadside safety treatments is based on an evaluation process described in the US...
Lundi, 17 Août, 2020 - 14:00
This study was designed to assess capacity changes due to the introduction of connected vehicles (CVs) and automated vehicles (AVs) on Virginia freeway corridors. Overall, three vehicle types, including legacy vehicles (LVs); vehicles equipped with adaptive cruise control (ACC) (AVs);and vehicles equipped with cooperative adaptive cruise control (CACC) (...
Lundi, 17 Août, 2020 - 14:00
The objectives of this study were to assess inlaid pavement marker (IPM) performance and estimate their safety effectiveness. IPM performance was evaluated through a count of marker presence and a feedback survey from participants who viewed dry and wet night videos of IPM sections in the St Louis area. The safety effectiveness of IPMs was evaluated using a...
Lundi, 20 Juillet, 2020 - 13:45
Since 2009, when NCHRP's last Security 101 report was released, there have been significant advances in transportation security approaches, including new strategies, programs, and ways of doing business that have increased the security of transportation systems as well as ensured their resiliency.
Hazards and threats to the system have also continued...
Lundi, 20 Juillet, 2020 - 13:45
Dynamic Messaging Signs (DMS) and Rural Intersection Conflict Warning Signs (RICWS) are roadside signs that feature much larger and heavier signs than are typically placed on their respective support systems. The excess weight and size of these signs, in conjunction with their breakaway support systems, introduces vibration problems not seen in the past. The...
Lundi, 20 Juillet, 2020 - 13:45
Authors of this research developed a traffic simulation model for the downtown San Jose network and evaluated five different street redesign and travel demand combinations. This model aids understanding of network-wide effects of changes in street design for local and regional agencies who are interested in implementing complete streets and/or one-way to two-...
Lundi, 20 Juillet, 2020 - 13:45
Public transit systems serving rural areas across Greater Minnesota will now be able to measure and demonstrate their value in actual dollars, thanks to new research that resulted in a method for calculating the benefits these transit services provide. In every case study they reviewed, researchers discovered that the benefits of public transit outweighed the...
Lundi, 20 Juillet, 2020 - 13:30
Horizontal curves are a common and essential element of the rural highway system, and it is essential to sign and mark them consistently to minimize curve crash risk. Curve signing and marking consists primarily of conducting an engineering study to set the curve advisory speed, posting the advisory speed if necessary, and providing other signs and markings (...
Lundi, 13 Juillet, 2020 - 13:30
HFSTs are pavement surfacing systems that provide skid-resistant, and deck sealing properties not typically associated with conventional materials. The spot application of a thin layer of durable, high friction aggregates as a topping on specially engineered resin or a polymer binder affords long-lasting traction (as stated by manufacturer information), while...
Lundi, 13 Juillet, 2020 - 13:30
Chloride infiltration into concrete is the major cause of corrosion induced delamination in steel reinforced bridge decks and repairing delaminated concrete is a major cost factor in bridge deck rehabilitation.
The TRB Highway Innovations Deserving Exploratory Analysis Program's Determining Bridge Deck Chloride Quantities Using Ground Penetrating Radar...
Lundi, 15 Juin, 2020 - 14:00
This study is comprised of two main analyses: (1) a national analysis that assesses the relationship between the presence and quantity of transitway service with the overall economic strength of US Metropolitan Statistical Areas (MSAs) and (2) a comparative analysis of accessibility to regional employment centers, educational institutions, and workforce...
