Project Spotlight

Guidelines Developed for Low-Water Crossings on Low-Volume Rural Roads in Illinois

Published January 23, 2017

Low-water crossings (LWCs) are roads over small creeks and streams and are designed to be overtopped by water during a high flow event. These LWCs are located on low-volume roads with fewer than 25 vehicles per day—typically access roads to farm fields. For these crossings, it is not necessary or feasible for the local highway department to install a bridge. Therefore, a LWC can be designed and constructed to provide a safe, economical, and environmentally friendly pathway to endure overtopping events.

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Guidelines Developed for Hot-Poured Crack Sealant Treatments

Published November 21, 2016

Crack sealing is a cost-effective, preventive maintenance method that helps extend the service life of pavements by preventing liquid and solid materials from penetrating the pavement system. Depending on the temperature of the sealing material at the time it is applied, sealants are classified as either “cold-pour” or “hot-pour.” When properly selected and installed, sealants have the ability to extend the service life of pavements from three to five years.Read More

Modified Right‐Turn Lane Design Improves Road Safety and Operations

Published October 17, 2016

Exclusive right-turn lanes are usually associated with improved safety because they tend to separate the conflicts between turning vehicles and through traffic. However, right-turn lanes on state routes are designed in a way that accommodates large vehicles, such as semi-tractor trailer trucks. At these intersections, raised channelized islands with exclusive right-turn lanes are commonly used, and there is a large turning radii.Read More

Urban Watersheds Added to StreamStats, an Online Tool for Estimating Watershed Peak Flows, by ICT/USGS Researchers for IDOT

Published October 17, 2016

The Illinois Department of Transportation (IDOT) owns or maintains more than 8,000 bridges over waterways throughout the state. IDOT’s Central Bureau of Bridges and Structures (aka the Bridge Office) employs state-of-the art tools to help ensure that bridge and culvert waterway openings are adequately designed to provide safe crossing.Read More

ICT Project Combines Weather Data and Computer Models to Help IDOT Highway Maintenance Crews Keep Illinois Roads Clear

Published October 17, 2016

Obtaining an accurate picture of road conditions at any given time is a great benefit to motorists and road construction and maintenance crews. Currently, highway maintainers use weather forecast sites and road weather information system (RWIS) data to support winter maintenance decisions. Combining weather forecast data with pavement models creates a new dataset that can be highly useful to IDOT, as well as to municipal and county agencies.
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