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
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
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
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.
Approximately 27% of all intersection crashes in the United States are associated with left turns, with more than two-thirds of those occurring at signalized intersections. Various traffic signal control strategies have been implemented to balance concerns about both the efficiency and safety of left-turning traffic. Read More