Current geometric design of roadway elements is based primarily on the design speed. The design speed is used by roadway engineers to design appropriate safety elements such as vertical and horizontal curves, stopping sight distance, and guardrail needs. On rural highways, operating speed is often higher than the design speed, which may become problematic from a safety standpoint. In rural settings, there are also more free-flowing traffic conditions with limited enforcement opportunities. These circumstances often lead to increased crashes.Read More
A recently completed project sponsored by IDOT and conducted by ICT investigated the effectiveness of sensor network systems for detecting traffic jams or stopped traffic, estimating travel times and delays for motorists, and estimating speed of vehicles in and approaching roadway work zones.Read More
Findings from three safety-related research projects conducted by the Illinois Center for Transportation (ICT) on behalf of the Illinois Department of Transportation (IDOT) have been implemented as a technology deployment webinar series geared to IDOT and local agency staff, as well as consultants, designers, and contractors who are involved with roadway construction and maintenance in Illinois.
The webinars were recorded and are available for viewing online (links provided below).
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.
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