The data comes from NZTA, and was published for the period Jan 2000 to current year as public CSV files.
The NZTA compiles police crash reports into an internal system called CAS (Crash Anaylsis System)
We have analysed all the crash data to identify places where there are many crashes within close proximity.
In fact each hotspot represents the crashes within a 25 m radius circle.
Most hotspots are intersections but there are also dangerous bends and so on.
For each hotspot we identify further information about it such as trends, primary causes, and provide charts of this.
Yes, you can see the hotspot map and information on any device from the same web site using responsive web design
On the crashes map, you can bring up the Search panel. Under Type of Vehicle, you can select "Bicycle"
On either the crashes or hotspot map, you can bring up the Search panel.
After you have made selections and got the results you want you can press the Get Link button.
This generates a tiny url which copies all your settings.
When someone opens the tiny url, they should see what you see.
On the hotspot map, you can bring up the Search panel.
There is a selection for Trend over Time for Improving / Worsening / Staying the Same.
Press search to see the results.
The data is currently only sourced from the NZTA who compile it from police reports.
There is some under reporting of severe injuries, and very significant under-reporting of minor and non injury crashes.
It takes time for police reports to be completed and compiled into the NZTA CAS system. There can be a delay of several months.
We upload more recent data as and when it becomes available to us.
You should find the correct behaviour in all modern browsers such as IE 11, Chrome, Mozilla, Safari, Edge.
The page attempts to center the map on your current location in order to show you relevant locations and crash information.
Its quite OK to refuse location, or to not be able to provide it, in which case the map will be centered on Auckland.