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Junction Detail

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==In STATS19==
==In STATS19==
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Junction codes are only used for crashes which occur at or within 20 metres of a junction.  If two or more junctions are present within 20 metres  
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Only crashes which occur at or within 20 metres of a junction are coded by Junction Detail.  If two or more junctions are present within 20 metres,
the junction closest to the to the crash location is used.
the junction closest to the to the crash location is used.
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G. Code 03, 'T or staggered junction' includes 3 arm junctions at which 2 roads join at an acute angle (previously known as 'Y' junction).
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The following definitions apply to particular varieties of junction:
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H. Use code 05 'Slip road' only for accidents occurring within 20 metres of the point where a slip road (including filter lane at roundabout - See 1.14 Note F) merges with or diverges from the nearside of the main carriageway.  
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*'''T junction''' includes 3 arm junctions where 2 roads join at an acute angle (sometimes known as 'Y' junctions).
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*'''Crossroads''' refers to four arm junctions where the alignment of both roads is uninterrupted whatever the angle of the crossing, and the arms are not staggered.
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Accidents occurring on slip roads, within 20 metres of a roundabout should be coded 01 or 02 as appropriate. Accidents occurring on slip roads which are not within 20 metres of a junction should be coded 00.
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*'''Multiple junction''' refers to all junctions with more than four arms, except [[roundabouts]].
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I. Crossroads: four arm junction where the alignments of both roads are uninterrupted whatever the angle of the crossing, and the arms are not staggered.
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J. Multiple Junction: a junction with more than 4 arms (except roundabouts).
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'''Slip roads''' which lie within 20 metres of a roundabout are considered to be part of the roundabout for the purposes of junction detail.  Also, crashes on slip roads over 20 metres from a junction are not considered to be at the junction.  Therefore, only crashes occurring within 20 metres of the point where a slip road
 +
merges with or diverges from the nearside of the main carriageway are classified as slip road junctions.
==In MAST==
==In MAST==
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Junction Detail is avaialble as a [[dimension]] to [[power users]] in MAST [[reports]].  It is organised as follows:
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Junction Detail is available as a [[dimension]] to [[power users]] in MAST [[reports]].  It is organised as follows:
*None
*None

Current revision as of 10:58, 2 June 2010

Junction Detail is a STATS19 field which indicates the general layout of the junction where a crash occurred, if any.

In STATS19

Only crashes which occur at or within 20 metres of a junction are coded by Junction Detail. If two or more junctions are present within 20 metres, the junction closest to the to the crash location is used.

The following definitions apply to particular varieties of junction:

  • T junction includes 3 arm junctions where 2 roads join at an acute angle (sometimes known as 'Y' junctions).
  • Crossroads refers to four arm junctions where the alignment of both roads is uninterrupted whatever the angle of the crossing, and the arms are not staggered.
  • Multiple junction refers to all junctions with more than four arms, except roundabouts.

Slip roads which lie within 20 metres of a roundabout are considered to be part of the roundabout for the purposes of junction detail. Also, crashes on slip roads over 20 metres from a junction are not considered to be at the junction. Therefore, only crashes occurring within 20 metres of the point where a slip road merges with or diverges from the nearside of the main carriageway are classified as slip road junctions.

In MAST

Junction Detail is available as a dimension to power users in MAST reports. It is organised as follows:

  • None
  • Normal
    • T junction
    • Crossroads
  • Roundabout
  • Private drive
  • Other
    • Multiple junction
    • Slip road
    • Other
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