John Bigham
Highway Safety Manual network screening
The Highway Safety Manual was developed by American Association of State Highway and Transportation Officials (AASHTO). It provides guidance and tools to conduct…
Geocoding collisions at non-existent street network locations
In continuation of our geocoding overview series, today's post describes the scenario where a collision cannot be geocoded because the location…
Geocoding collisions at offset intersections
Today's blog post tackles the first geocoding issue outlined in our geocoding overview series: how to handle geocoding collisions at offset intersections.…
City of Los Angeles geocoded SWITRS data free download
UPDATE Geocoded SWITRS data is now provided through the City of Los Angeles Geohub. You can search for SWITRS to…
Geocoding collision data for RoadSafe GIS
Accurately geocoding collision data is necessary when building a collision database that will be used for spatial analyses. Geocoding is the process of…
Announcing the HSIP Helper
We are happy to introduce the HSIP Helper at www.HSIPhelper.com for agencies to explore systemic countermeasures for their California HSIP Cycle…
California HSIP Cycle 7
UPDATE: See Cycle 8 blog post for the latest information. Caltrans has announced plans for $150 million to be distributed…
Collisions vs Injuries
Evaluations of collision data inevitably require summarizing the number of collisions or injuries occurring on a roadway or region. Target…
Querying for pedestrian related collisions
Collision data is inherently complicated since it attempts to aggregate all the elements of a collision into a nice, standardized…
Collision data GPS coordinate accuracy
The usefulness of RoadSafe GIS or any other software solution is heavily dependent on the quality of the input data.…