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Posted Road Speed

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MyGeotab has posted road speed limit support where the data comes from the following two sources:

  • Navteq maps
  • Open Street Maps (OSM)

Creating custom speeding rules

speedlimit.png

Create a new rule and then go to the Conditions -> Add speed limit. There are two options in this area: the "over the limit by" value and "exclude estimate speed limit". The "over the limit by" value is the speed that the vehicle needs to over the speed limit by to generate a speeding exception. The term "estimate" means that the speed limit data did not come from road surveys. More specifically, estimate in this case means that the data was calculated with an indirect method such as using aggregate vehicle flow, statistical analysis of road segments, or statistical regionalized road type speed classifications. 

How to submit a posted road speed change to Open Street Maps

MyGeotab offers a road speed update feature, where the user can update any road and have that new speed limit honored for all future speeding rules. To make these changes, simply left click on the road in the map within MyGeotab and an option will be provided to update the posted road speed as shown in the image below.  All of these changes are then given back to the OpenStreetMaps community, where they are audited and added to the road data set.

2014-11-27 10_41_12-Map _ MyGeotab.png

If the road segment does not have the correct length, positioning, or is non-existant, the user can fix this by first making an account at http://www.openstreetmap.org/, and then editing the roads on the OpenStreetMaps website. Users can edit the name of the road, speed limit, reshape existing roads, and draw new roads in. OpenStreetMaps is an open source resource and works like Wikipedia in terms of editing where everyone benefits from the data users provide.

2014-11-27 11_07_36-OpenStreetMap.png

Changes from OpenStreetMaps are updated into MyGeotab monthly, thus changes into this system will not take immediate effect. Navteq maps are updated when they release new data quarterly.

Viewing speeding exceptions

Besides viewing speeding exceptions in the exceptions report or some other customized report, MyGeotab offers features for better viewing these exceptions.

In the trips history report, the speeding exceptions are shown overlaying the trip path. Each point in the exception will show the vehicles speed and also the speed limit of the road pointed at. It is important to realize that this may not be the speed limit used to process the exception. This is because it is possible that you will be pointing your mouse at a nearby road, or an intersecting road which is not the best fit road path for the trip.

A much more accurate way to view and compare speed limit rules is by using the speed profile report. This enables the user to visually compare the speed of the vehicle to the speed limit. If you hover your mouse over the different points on the graph it shows data including the time, speed, and speed limit. It is easy to look up the time of the exception and review in this manner. The speed profile can be accessed through the left side menu, or in the arrowed options for each trip on the trips history report.

 

 

Mauricio Muniz

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5 comments

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If a user of 5.7 edits a road speed right on the map, is this a "private" change that is only reflected in that database or is it submitted for global change?  For example, we have school zones that are not legally posted as 30kph but the common practice is to observe the suggested limit... common enough that the posted limit actually says 30kph in what Geotab is pulling.   Those that want it to reflect the actual legal speed of 50kph will likely use the edit feature.  So if that is done, will that affect other database users who want it kept to 30kph (and perhaps perpetuate repeated back and forth changes month after month) or is a change made within 5.7 just considered by vehicles in the database that makes the change?  

Justin Streich 0 votes
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Justin,

As per the Geotab Product Guide:

Geotab shares the changes you make to posted road speeds with all customers. That way, everyone benefits from each others changes. On a monthly basis, Geotab will send the latest posted road speeds to OpenStreetMaps, where they will make them available to everyone else on the Internet.

Mauricio Muniz 0 votes
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Eron,

We are in the process of providing an update to the instructions above.

Harjot Singh 0 votes
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Eron,

Having spoken to a developer there are quite a few features being added to 5.7.1. , they have mentioned that it is best to wait until his new feature is completed and tested on the beta, before a response is provided. Estimated time remaining for testing is still a couple weeks. If you would like a direct response on when a update will be made available please open a case with the support team.

Harjot Singh 0 votes