Current and Upcoming Features

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Presentation transcript:

Current and Upcoming Features Star quality ratings Searching with filters Recent features: Reorganized navigation User guide with video tutorials State CMF lists Upcoming features: Comparison tool

Star Quality Rating Criteria Study design Sample size Standard error Potential bias Data source

Study Design Methodology of the study Excellent: Statistically rigorous study design with reference group or randomized experiment and control Fair: Cross sectional study or other coefficient based analysis Poor: Simple before/after study

Sample Size Crashes, mile-years, site-years, miles, or sites Ex: 8 miles for 5 years is 40 mile-years Excellent/fair/poor: Larger is better. Rating depends on size of sample, with considerations for study design.

Standard Error Statistical indication of the reliability of the CMF value Excellent: Significant at 95% confidence level (SE=0.05, CMF=0.80) Fair: Significant at 90% confidence level but not 95% confidence (SE=0.11, CMF=0.80) Poor: Not significant at 90% confidence level (SE=0.20, CMF=0.80)

Potential Bias Any biases observed by the reviewer Ex: Makeup of the study site group, issues with analysis or modeling, etc. Excellent/fair/poor: Better rating for fewer biases.

Data Source Diversity of the data used to develop the CMF Excellent: Diversity in States representing different geographies Fair: Limited to one State, but diversity in geography within State (e.g., CA) Poor: Limited to one jurisdiction in one State

Star Quality Rating

Using Filters Search “signal” (581 results) Filter for only 3,4, or 5 star CMFs (389 results) Filter for only angle crash CMFs (38 results) Filter for only urban CMFs (24 results) Discuss all results, why various categories appear

CMFs that look similar in search results Search for “rumble” Filter for “run off road” crash type and crash severities of fatal, serious injury, and minor injury Expand shoulder treatments -> Shoulder rumble strips -> Install shoulder rumble strips What makes the 1st and 2nd ones different? Go to Details, see differences in road type and division; AADT range; states of origin

Comparison CMF = 0.64 CMF = 0.83

Comparison CMF = 0.64 CMF = 0.83

Website Features Recently added Upcoming Reorganized navigation User guide with video tutorials State CMF lists Upcoming Comparison tool