Recently Added SPFs

SPF format: N = ea * AADTmajb * AADTminc
a b c overdispersion
Total Accidents -3.47 0.42 0.14 0.3
Fatal & Injury Accidents -3.47 0.42 0.14 0.3
  1. Roundabout
  2. Urban
  3. two-lane
Added by:
andrew Kwasniak
Date added: :
2022-06-11
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Zoom
SPF format: N = ea * AADTmajb * AADTminc
a b c overdispersion
Total Accidents -9.085 0.606 0.278 0.286
Fatal & Injury Accidents -9.778 0.603 0.279 0.288
  1. Intersection
  2. Urban
  3. four-leg
  4. signal control
Added by:
Andrew Kwasniak
Date added: :
2020-10-21
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Zoom
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Zoom
SPF format: N = ea * AADTb * L
a b overdispersion
Total Accidents -7.805 1.020 0.461
Fatal & Injury Accidents -7.807 1.020 0.461
  1. Segment
  2. Urban
  3. multilane
  4. undivided
Added by:
Andrew Kwasniak
Date added: :
2019-06-30
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{"100":0.044613159371994,"4100":1.97016461022,"8100":3.9456421924439,"12100":5.9416088461204,"16100":7.9510662724399,"20100":9.9706382196129,"24100":11.998317862876,"28100":14.032770613677,"32100":16.073043231825,"36100":18.118420124338,"40100":20.168343981788,"44100":22.222368299412,"48100":24.28012720385,"52100":26.341315346588,"56100":28.405673982863,"60100":30.472981023973,"64100":32.543043737929,"68100":34.615693270987,"72100":36.690780454919,"76100":38.768172543289,"80100":40.84775063265}
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Information on SPF

Safety Performance Function (SPF) is a mathematical representation that relates the number of crashes to different site characteristics. The most common site characteristic used in SPF is Annual Average Daily Traffic (AADT).

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How to use SPF Clearinghouse

It is very simple to use SPF Clearinghouse. You can search reported SPFs by category (e.g., intersection, segment, ramps, etc.) or by keyword.

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Why do we need SPF Clearinghouse?

Numerous SPFs are being developed every year and are being published by researchers. The SPF Clearinghouse was built to facilitate and share SPFs among researchers and practitioners. 

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Resources

Links, articles, research studies, tools, and more...

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