Written by Muneeb Rana · Last updated 26 October 2026
Quick answer: A speed limit app shows the posted limit for your road, usually from map data, and may alert you when you exceed it. Accuracy depends on the database: limits change and temporary zones are often missing. Speedometer PRO does not include speed limits or alerts; it shows your GPS speed, odometer, trips, map and HUD.
TL;DR
- Limits come from map databases.
- Data can be outdated or missing.
- Alerts help but never replace signs.
- Speedometer PRO: no limit data.
- Posted signs always take precedence.
How a speed limit app gets data
Apps match your GPS position to a road segment and read a stored limit from commercial or open map data. Errors creep in at junctions, parallel roads and recently changed limits.
Features to look for
- Clear display that does not need interaction
- Audible alert threshold you set before driving
- Data source and update frequency
- Works with screen mounted
- Respectful of privacy
Limits of any app
Temporary work zones, variable motorway limits and school zone times are hard to capture. Treat the app as a reminder.
Speed limit app vs speedometer
| Speed limit app | Speedometer PRO | |
|---|---|---|
| Live speed | Yes | Yes |
| Posted limit | Yes | No |
| Overspeed alert | Often | No |
| HUD mirror | Some | Yes |
| Odometer/trips | Some | Yes |
Using both
Navigation apps often show limits. Keep only one on screen and set it before driving. See best speedometer apps.
Where limit data comes from
Apps that show limits use map databases from sources such as OpenStreetMap or commercial providers. Data can be missing or outdated, especially for temporary or variable limits. Road signs always take priority.
What Speedometer PRO does
Speedometer PRO does not display speed limits. It shows your GPS speed so you can compare it with the signs you see.
Variable limits
Smart motorways, school zones and roadworks use variable or temporary limits that map data often misses. Watch the signs.
Treat alerts as hints
Alerts help, but posted signs always take priority.
Roadmap
We will update this page if speed limit features are added.
Related: Speedometer app safety: how to use it without distraction · US speed limits explained · The dangers of speeding · Best speedometer apps in 2026 · Speedometer app features · Speedometer app alternatives · Stopping distance calculator · Phone mount placement: where to put your phone
Get Speedometer PRO on Google Play · Download on the App Store · Set it up before you move; never handle your phone while driving.
Sources
- Speed limits in the United States (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
- Speeding (NHTSA): nhtsa.gov (accessed 26 October 2026)
- Distracted Driving (NHTSA): nhtsa.gov (accessed 26 October 2026)
FAQ
Does Speedometer PRO show speed limits?
No. It shows your GPS speed, distance, trips, map, compass and HUD mode, but not speed limits or alerts.
How accurate are speed limit apps?
They depend on map data, which can be wrong or outdated. Always follow posted signs.
Can a speed limit app stop me getting tickets?
No app can guarantee that. Drive to posted limits and conditions.
Do I need internet for limit data?
Many apps download limit data with maps, so they may need data or offline maps.
Is an overspeed alert distracting?
A brief sound is usually less distracting than reading a screen. Set it up before driving.