Difference between revisions of "Category:233 At - Grade Intersections"

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An at-grade intersection is an area where two or more roadways join or cross.  It also includes the roadside facilities for traffic movement within the area.  Each intersection involves through or cross-traffic movements on one or more roadways and may involve turning movements between these roadways.  The main objective of the intersection is to facilitate the convenience, ease, and comfort of people traversing the intersection while enhancing the safe and efficient movement of motor vehicles, bicycles and pedestrians.  To accomplish this task, the intersection must have the capacity to handle all the volume of traffic flowing through it.
 
An at-grade intersection is an area where two or more roadways join or cross.  It also includes the roadside facilities for traffic movement within the area.  Each intersection involves through or cross-traffic movements on one or more roadways and may involve turning movements between these roadways.  The main objective of the intersection is to facilitate the convenience, ease, and comfort of people traversing the intersection while enhancing the safe and efficient movement of motor vehicles, bicycles and pedestrians.  To accomplish this task, the intersection must have the capacity to handle all the volume of traffic flowing through it.
 
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There are five basic elements to be considered in the design and operation of an intersection
 
There are five basic elements to be considered in the design and operation of an intersection
  
* [[Human Factors|Human factors]]
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* [[media: 233 Human Factors.doc|Human factors]]
* [[Traffic and Safety Considerations|Traffic and safety considerations]]
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* [[media: 233 Traffic and Safety Considerations.doc|Traffic and safety considerations]]
* [[Physical Elements|Physical elements]]
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* [[media: 233 Physical Elements.doc|Physical elements]]
* [[Economic Factors|Economic factors]]
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* [[media: 233 Economic Factors.doc|Economic factors]]
 
* [[Functional Intersection Area|Functional intersection area]]
 
* [[Functional Intersection Area|Functional intersection area]]
  
 
Intersections having three or four legs are the most common and efficient in their operation.  Intersections with more than five legs are to be avoided.  Basic traffic management at an intersection can be placed in one of the following categories:
 
Intersections having three or four legs are the most common and efficient in their operation.  Intersections with more than five legs are to be avoided.  Basic traffic management at an intersection can be placed in one of the following categories:
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* [[233.1 At-Grade Intersections - Driveways and Entrances|Driveways and Entrances]]
 
* [[233.1 At-Grade Intersections - Driveways and Entrances|Driveways and Entrances]]
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* [[643.4 Railroads|Railroad-highway grade crossings]]
 
* [[643.4 Railroads|Railroad-highway grade crossings]]
  
[[Image:233 Photo 3.jpg|thumb|right]]Other factors can also affect the efficient operation of an intersection.  These are:
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Other factors can also affect the efficient operation of an intersection.  These are:
 
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* The presence of [[641.1 Bicycle Facilities|bicyclists]]
 
* The presence of [[641.1 Bicycle Facilities|bicyclists]]
 
* The presence of [[642.1 Pedestrian Facilities|pedestrians]]
 
* The presence of [[642.1 Pedestrian Facilities|pedestrians]]

Revision as of 07:32, 12 June 2009

233 Photo 1.jpg

An at-grade intersection is an area where two or more roadways join or cross. It also includes the roadside facilities for traffic movement within the area. Each intersection involves through or cross-traffic movements on one or more roadways and may involve turning movements between these roadways. The main objective of the intersection is to facilitate the convenience, ease, and comfort of people traversing the intersection while enhancing the safe and efficient movement of motor vehicles, bicycles and pedestrians. To accomplish this task, the intersection must have the capacity to handle all the volume of traffic flowing through it.

Rural Expressway, Median Crossovers
Report 2001
Report 2004
Summary 2004
See also: Innovation Library

There are five basic elements to be considered in the design and operation of an intersection

Intersections having three or four legs are the most common and efficient in their operation. Intersections with more than five legs are to be avoided. Basic traffic management at an intersection can be placed in one of the following categories:

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It is important to provide adequate sight distance clear of obstructions within the functional area of the intersection to ensure a driver’s view of other vehicles is not blocked.

While most individuals understand intersections occur at roadway crossings, there are other types of intersections:

Other factors can also affect the efficient operation of an intersection. These are:

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Signalized intersections can be considered for expressways that pass through communities. In a rural area, a designer is not to consider including a signalized intersection for a new expressway, although one may be installed at an existing expressway intersection with the recommendation of the Traffic Division. The distance between intersections along MoDOT roadways is dependent on whether the road is major or minor, rural or urban. The Access Management Guidelines is to be used to determine desirable spacing of at-grade intersections. The NCHRP 500 series is a good source of information when considering improvements at an at-grade intersection.