County Wide Check

The overall crash pattern is essentially identical, Kernal Density Plots of the Pinellas County Crashes are below.

However the Forward Pinellas data does have less crashes, 118906 compared to 120838 in the signal 4. Overall it is minor difference of about 1.5% and could be due to a variety of methodological differences or spatial accuracy of reporting as I had to filter both data sets down to the County spatially. Without a full comprehensive overview of each data sources methodology I can’t be any more specific without wildly speculating, however a 1.6% difference is still minor.

Measure Signal 4 Forward Pinellas Difference Pct Difference
Total Crashes 120,838 118,906 1,932 1.6%
Serious Injuries 3,590 3,585 5 0.14%
Fatalaties 593 613 -20 -3.37%
Pedestrian Crashes 2,791 3,359 -568 -20.35%
Bicycle Crashes 3,701 3,743 -42 -1.13%

Further investigation shows the biggest difference is in Pedestrian Crashes, the could be caused by vehicles involved being interpolated by one of the sources, but it is impossible to determine without further investigation.

Corridor Crashes

The overall crash pattern is essentially identical, Kernal Density has some issues at this scale with this map projection, I could push everything down to a better one if we need but to my eye there isn’t a major difference.

However in the corridor, the Signal 4 data has less crashes, 3866 compared to 4003 in the Forward Pinellas data. Overall it is minor difference of about 3.5%, again it is impossible to come to a concrete conclusion for the disagreement.

Measure Signal 4 Forward Pinellas Difference Pct Difference
Total Crashes 3,866 4,003 -137 -3.54%
Serious Injuries 116 112 4 3.45%
Fatalaties 22 22 0 0%
Pedestrian Crashes 144 170 -26 -18.06%
Bicycle Crashes 203 201 2 0.99%

There is more alignment with injuries, fatalities, and bike/ped crashes in the corridor than in the county at large, though bike/ped does have the biggest disagreement.