Brand new user, so please excuse me off this isn’t the correct location to ask, or if this has been discussed previously. I drive a Tesla with Full Service Drive (FSD), which navigates automatically. I’ve heard they get mapping data from this organization. In many locations, before the car sees a speed limit sign (in narrow, windy local neighborhood streets, etc.), the car erroneously defaults to 35 MPH, when the safe speed limit is 25 MPH. In fact, as soon as I put my car in drive, it shows 35 MPH (while I’m still in my garage and driveway). This continues until the car sees a sign. Other times, the car defaults to 25 MPH before it sees a sign on a busy four lane road with a 45 speed limit. The problem is, the car will drive the speed limit (plus or minus an offset) as soon as FSD is engaged, so if I were to use it in my neighborhood, the car would dangerously race to 35 MPH. Obviously, I can't use it on these roads. This issue has been present for a few updates, and it's nearly impossible to communicate to Tesla to fix, so I was wondering if it can be adjusted here? Is the speed limit data supplied by this organization? If so, can it be corrected? Thanks

asked 18 Nov, 20:38

Larryd517's gravatar image

accept rate: 0%

edited 18 Nov, 20:44

I do not know if Tesla uses OpenStreetData or not.

But to answer your questions: Yes, OpenStreetMap has "tagging" allowing a mapper to indicate what the speed limit is on every road. However, many, many roads are not tagged with speed. So any navigation app (or car) that uses OpenStreetMap data will make default assumptions to use for roads that do not have the speed limit tagged.

You don't say where you are, but if you open the map at and go to your location you can either:

  • Open the data in an editor using the "Edit" pull down on the top left. You will need to be logged into a free account to be able to edit.

  • Or if you only want to verify that the road(s) in your area specify the "maxspeed" then on the right side of the map is a icon with several stacked layers. Click on that to expand a side bar. On the side bar click on the check box by "Map Data". All of the actual data will be outlined in blue. Click on the blue line on the road(s) of interest to see how they are tagged. When you click on the "object" a side bar will pop up on the left side showing all of the characteristics (tags) for that road.

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answered 18 Nov, 23:15

n76's gravatar image

accept rate: 17%

Thanks. I played around and made edits to my local roads, requesting someone to review. They were not any speed limits on the roads, as opposed to the wrong limit showing. I set them to 25. Not sure if the car will get the information, and if so, how long the changes take to get there.

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answered 19 Nov, 08:14

Larryd517's gravatar image

accept rate: 0%

edited 19 Nov, 12:24

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question asked: 18 Nov, 20:38

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last updated: 21 Nov, 21:58

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