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An intersection or an at-grade junction is a junction where two or more roads converge, diverge, meet or cross at the same height, as opposed to an interchange, which uses bridges or tunnels to separate different roads. Major intersections are often delineated by gores and may be classified by road segments, traffic controls and lane design.
At-grade may refer to: At-grade intersection, a crossing between roads on the same level; Road junction; Level crossing, where a road or path crosses a railway on the same level; Diamond crossing, where two railway tracks cross; At-grade railway, at level with the general surface
Grade-separated pedestrian and cycling routes often require modest space since they do not typically intersect with the facility (such as a highway) that they cross. However, grade-separated pedestrian crossings with steps introduce accessibility problems. Some crossings have lifts, but these can be time-consuming to use.
“Roundabouts are the safest type of at-grade intersection. They create slower speeds, fewer conflict points for pedestrians and motorists, and reduced collision angles compared to stop signs or ...
I-70 briefly follows an at-grade portion of US 30 with traffic lights in Breezewood, Pennsylvania. There are gaps in the Interstate Highway system, where the roadway carrying an Interstate shield does not conform to the standards set by the Federal Highway Administration (FHWA), the body that sets the regulations for the Interstate Highway System.
More expensive, grade-separated interchanges generally offer higher throughput at higher cost. Single-grade intersections are lower cost and lower throughput. Each main type comes in many variants.
But where traffic volumes are higher, the two intersections within the interchange often feature additional traffic control measures such as traffic lights and extra lanes dedicated to turning traffic. The at-grade variant of the diamond interchange is the split intersection.
The closure will allow construction crews to use the existing at-grade intersection to build a new interchange. R-70/580th Avenue south of U.S. 30 was closed on Monday, Aug. 5 for the same project