Roadsign assist very inaccurate

RSA does not work well at all - I disable it and I never really use it. I usually look at the road, so RSA doesn't really help me also because it does not beep or regulate speed if you are faster than the speed limit it recognises. And considering how bad it is recognising, thank goodness it doesn't.
It even doesn't understand that stickers of speed limits on trucks are not real speed limits...

 

I'm pretty sure it's a GPS database, not a sensor function!

 

Not at all - it is a camera image recognition system. This is why it is not working that well. And why it is showing speed limits when there are none on German Highways, reading speed sign stickers on trucks (by law they need to show what are the fastest speed they can travel on highways and regional roads). And not doing a very good job at all ignoring them...

 

I wouldn't call it a fault but simply the limitations of the technology. Here in London, I find it works very well 90% of the time. There are also speed camera audible alerts if you have the Toyota navigation system. I find the combination of RSA and the audible alerts rather good.

Posted via the PriusChat mobile app.

 

Mine too keeps getting confused with the speed signs it thinks it's seen. Use the pinch of salt principle!

 

In Europe it actually uses image recognition, and the feature is called RSA (Road Sign Assistance?).

In the US (and probably Canada) we don't have RSA as an option. Instead we have a speed limit display, based on static data from the navigation database (if equipped) as you suspected.

 

RSA is garbage. It works accurately 20% of the time and 10% of the time it does work it is completely annoying popping up on the HUD.