Vehicle Speed Recordings in Playground Zones (30 km/h)

So What is a Driver Feedback Sign Anyway

Driver Feedback Signs

Driver feedback signs are signs that typically display the speed that an approaching vehicle is going.  The intention of doing this, is if the driver is going over the speed limit, that they would adjust their speed accordingly.  What the sign displays and behaves in alerting the driver are programmable, so no two signs may behave the same. 

How It Works:

The speed data is captured in approximately 10 second windows.  The window duration varies more or less by the speed of the vehicle and certain other programmed parameters like average vehicle length and length of the detection zone.   During that 10 seconds the speed detected is compared to high and low speed memories.  When the 10 seconds expires, if a vehicle was detected, the highest and lowest speed memories are used to increment counts in the appropriate highest and lowest bin sets, and the highest and lowest speed memories are reset.     Every 15 minutes the Bin counts are committed to a log entry and all of the counts are reset.

How Many, How Bad and Where

Below you will see two charts.
The first chart represents the data collected when the vehicle was travelling at its fastest speed.
The concept/principle of the sign is to show the driver their speed and if that driver is going over the speed limit, that they should adjust their speed accordingly.
And so, the second chart represents the data collected when the vehicle was travelling at its slowest speed.  It is expected to see a very distinct drop in the percentage of vehicles going over the speed limit and/or the percentage of vehicles having reduced their speed.
More emphasis should be drawn to the second chart, as any vehicles going over the speed limit at this point probably would not have adjusted their speed enough or accordingly, as a result of the driver feedback sign and perhaps other speed behaviour adjustments need to be taken (e.g. mobile photo enforcement).
With the second chart, if you notice a particular Site ID (shown along the bottom of the chart) has an unusually high percentage of vehicles still going over the speed limit, then with that Site ID, you can go to the map that follows and look up where that driver feedback sign is located (by using the filter for the map).  For those with school aged children, you may want to take note on if this driver feedback sign monitors and collects data from a road that runs along the school property of where your child attends school.

The Bad News

This first chart is the fastest speeds recorded by the driver feedback signs. 

Each bar represents the percentage of vehicles counted that were going faster than the posted speed limit.  Colours start at yellow and go to red with the faster speed recordings.
The black line represents all vehicles counted (vehicles going faster than the speed limit and vehicles going slower than the speed limit).
The blue line represents the vehicles counted that were only going over the speed limit (does not include vehicles going at or slower than the speed limit).
To help put things in perspective, there is a reference line at 10%, 20%, 30% and 40% of all vehicles counted were going faster than the posted speed limit.
Note:  To see monitoring sites to the right, hold the <ctrl> key and mouse click to drag the chart to the left to see the sites not showing.
Note:  Percentages have a margin of error of +/- 0.5% due the the way the percentages are calculated for this chart.

The Better News

This second chart is the slowest (adjusted) speeds recorded by the driver feedback signs.  
Each bar represents the percentage of vehicles counted that were going faster than the posted speed limit.  Colours start at yellow and go to red with the faster speed recordings.
The black line represents all vehicles counted (vehicles going faster than the speed limit and vehicles going slower than the speed limit).
The blue line represents the vehicles counted that were only going over the speed limit (does not include vehicles going at or slower than the speed limit).
To help put things in perspective, there is a reference line at 10%, 20%, 30% and 40% of all vehicles counted were going faster than the posted speed limit.
Note:  To see monitoring sites to the right, hold the <ctrl> key and mouse click to drag the chart to the left to see the sites not showing.
Note:  Percentages have a margin of error of +/- 0.5% due the the way the percentages are calculated for this chart.

OK, I see an Issue with Speed, Now What?

From looking at either of the charts above (it is recommended to use the second chart), you decide that you want to know where a particular monitoring site is, you first need to make note of the Site ID listed on the bottom of each chart (DFSxxx).
It is this Site ID that will be used to filter the DFS location map, to isolate the map to just show that one site.

Driver Feedback Sign Location Map

With the Site ID from above, click the Filter drop down and select or type the Site ID and then click apply.  The map should reduce down to just that one site and allow you to zoom in to see where in the city the speed issue is.


OK, So I See Where and How Bad, Now What?

For those driver feedback signs that are located near schools and would have speed data related to vehicles travelling around the school where it may impact student and staff safety - this could prove very useful.
Schools offer street crossing guards and/or additional signage for motorists to adjust their speed due to students and staff crossing street(s).
To help schools, that may have a greater degrees of speeding happening in and around them, a special story is built out, targeting specific driver feedback signs monitoring speeds in their area.  This will allow the school to monitor how effective the additional effort is having on speeding in the area.
Below is a growing list of schools with that story.