---
title: How accurate is HERE speed‑limit data?
description: Sometimes, due to changes in the data within the map, the speed segment may be incorrect. This is perfectly normal, as speed zones change frequently, and the map updates always lag behind changes in t
---

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# How accurate is HERE speed‑limit data?

## HERE’s speed‑limit data is highly accurate, industry‑validated, and one of the most reliable sources globally

 **1. High accuracy due to multi‑source validation**  
HERE states that its ISA (Intelligent Speed Assistance) map uses daily‑captured map data, camera‑sensor inputs from vehicles, local government sources, and AI/ML processing to maintain accuracy. This multi‑source approach significantly improves correctness compared to single‑source systems.

**2. Used by major OEMs**  
More than 70 vehicle brands and 200+ million vehicles rely on HERE’s speed‑limit data for safety systems, including ISA compliance. This level of adoption indicates strong industry confidence in its accuracy.

**3. Designed to overcome camera‑only limitations**  
HERE specifically highlights that its map can correctly identify limits even when signage is missing or unclear, which is a major advantage over camera‑only systems. In some regions, up to 60% of speed limits are implicit, making map‑based data essential.

**4. Coverage and freshness**  
HERE provides speed‑limit coverage in 180+ countries and positions itself as the “market leader” for ISA‑grade speed‑limit data.

**5. Practical reality**  
While HERE’s data is among the most accurate available, no provider is 100% perfect. Occasional mismatches can occur due to:

- Recent roadworks or temporary limits
- Local council changes not yet published
- Rural or low‑traffic roads with sparse data
- Complex conditional limits (school zones, time‑based limits)

But overall, HERE is considered top‑tier for commercial telematics and OEM‑grade driver‑assistance systems.

---

Other articles that may be useful:  
[How does speed affect my TZ Score?](http://9163591.hs-sites.com/knowledgebase/how-does-speed-affect-my-tz-score)  
[How is a speed event generated in FleetConnect?](http://9163591.hs-sites.com/knowledgebase/how-is-a-speed-event-generated-in-fleetconnect)

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