Safety Data and Analysis in Developing Emphasis Area Plans (2008) / Chapter Skim
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Pages 79-85
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From page 79... ...
3. Computerized roadway inventory data including traffic count data that can be linked to the crash data by location of the crash.
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From page 80... ...
Once these summaries are available, the following comparisons should be made: • Work zone rates to non-work zone rates for road type and type of work. • Work zone rates to non-work zone rates for work zone type • All fatal crashes to work zone fatal crashes • Total crashes to work zone crashes • All fatal and injury crashes to work zone fatal and injury crashes In addition to these comparisons, the following analysis should be completed for a sample of the construction projects completed in the current year: • Number of crash reports coded as work zone crashes versus the number of crashes found by query using location and date • Determine the number of crashes that were related to work activity One type of analysis that is done by the Ohio DOT is shown in Exhibit X-1.
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From page 81... ...
Exhibit X-1. Historical crash data analysis (Ohio DOT)
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From page 82... ...
There was also greater use of night and weekend work schedules to minimize congestion in work zones as discussed in Strategies 19.1 A4 – use nighttime work zones, and 19.1 F2 – improve coordination, planning, and scheduling of work activities. Level 2 Analysis In a Level 2 analysis, work zone crashes are flagged, and a highway inventory is available that can be linked to crash data.
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From page 83... ...
Office of Construction PDO = Property Damage Only (Number of PDO Crashes) Data From : Office of Traffic and Safety Highway Division Iowa Department of Transportation Interstates State Highways County Roads City Streets TOTAL CRASHES Crash Type Totals Exhibit X-3.
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From page 84... ...
Strategy 19.1 F1-develop/enhance agency level work zone crash data systems should be a priority if no flag is available on the crash data form to indicate a work zone crash.
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Time of Day Night 49 47 Day 50 52 Unknown 1 1 Day of Week Weekend 34 31 Weekday 66 69 Season Winter 22 16 Spring 24 26 Summer 27 31 Autumn 27 27 Roadway Function Rural, Interstate 7 13 Rural, Other 51 39 Urban, Interstate 6 15 Urban, Other 35 32 Unknown 1 1 Speed Limit 1–50 mph 44 38 55–75 mph 52 58 Unknown 4 4 Number of Vehicles Involved One 57 53 Two 36 35 More Than Two 7 12 Manner of Two-vehicle Collision Rear-end 13 35 Head-on 26 21 Angle 32 22 Side-swipe, Opposite Direction 21 15 Side-swipe, Same Direction 6 7 Other or Unknown 2 1 Exhibit X-4. Comparison of factors: percentages of work zone and non-work zone fatal crashes (data from FARS, 2003)
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