1 / 11

Segment Crash Analysis

Segment Crash Analysis. 6/2011. PE Services Roadway Begin/End Facility Type (2-lane) Rumblestrips. Analysts Rural/Urban Crash history Weighed ADT Distance Edge Risk Assessment Shoulder Type and Width Access Density Passing Zones. Information Gathering. Gravel Roads.

Download Presentation

Segment Crash Analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Segment Crash Analysis 6/2011

  2. PE Services Roadway Begin/End Facility Type (2-lane) Rumblestrips Analysts Rural/Urban Crash history Weighed ADT Distance Edge Risk Assessment Shoulder Type and Width Access Density Passing Zones Information Gathering

  3. Gravel Roads • Leave Gravel roads in the segment list • Be sure to note that its gravel • Gather crashes and ADT for segments, DO NOT get ERA & Access Density • DO NOT include in Rural Road Prioritization

  4. Crash Selection • Typically use Route Segment function • Search Distance: 25’ • Select All Crashes • Years: 2006-2010

  5. Duplicate Crashes • To be removed in Excel with Macro • Order of Priority • Assigned to officer coded roadway • Assigned to lower RP (typically W>E, S>N)

  6. ADT • Calculate weighted corridor ADT • 30% of segment – 100 ADT • 70% of segment – 150 ADT • Weighted Average – 30%*100+70%*150 = 135 ADT • Use most recent ADT information • Add text in the Excel file for documentation

  7. Distance • Options for gathering this data: • Google Maps • Bing (Live) Maps • ArcMap data from Mn/DOT • Determine distance to the nearest 0.1 mile.

  8. Edge Risk Assessment 1– Usable Shoulder, Reasonable Clear Zone • Be sure to add info about 2   2– No Usable Shoulder, Reasonable Clear Zone 2– Usable Shoulder, Roadside with Fixed Obstacles  3– No Usable Shoulder, Roadside with Fixed Obstacles

  9. Shoulder Width/Type • Gather shoulder type and width as part of the ERA drive • Be approximate with the width. 2’, 4’, 8’, 12’ etc.

  10. Access Density Depends on if segment is continuous or not • Road Access • Count each leg that intersects • Count only beginning termini for continuous segments • County beginning and end termini's for the last segment • Commercial • Residential/Farm Access 1 3 5 7 9 2 4 6 8 10     

  11. Passing Zones The distance between samples is : • 0-<2 mile segments, use 1,820 foot spacing • 2+ mile segments, use 3,140 foot spacing • NOTE: One concern was the use of the ½ and ¼ mile spacing of the samples would often fall at the typically 1-mile spaced intersections. So instead of the exact ½ and ¼ miles spacing, the decision was to go 500’ more.

More Related