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How does my car know speed limit?

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Took my Karoq 2.0L Diesel Edition - for its first really long trip over Easter - and I noted that as well as notifying me of fixed speed changes on roads (which my old car did via the sat nav) it also detects every single speed change on a managed motorway. Or even temporary speed restrictions in place due to roadworks. It literally always knows the speed limit. 

 

How does it do this? My old car knew the speed from Sat Nav data - but did not know what speed on a variable speed motorway section for example - nor could it know if there was a temporary speed restriction.

 

Is this data from online? If so its incredibly accurate. 

Your car has a camera at the top of the windscreen

  • 3 weeks later...

Has anyone had the system recognise any road sign other than speed limits and 'no overtaking'?

1 hour ago, JohnD5314 said:

Has anyone had the system recognise any road sign other than speed limits and 'no overtaking'?

Not personally, but we had parliament elections last month and then some cars recognized the round candidate numbers in billboards (ending 0) as speed limits. In 60 area they could get 110 or 130 limit.

Mine has Traffic sign recognition

 

On 13/05/2019 at 10:37, JohnD5314 said:

Has anyone had the system recognise any road sign other than speed limits and 'no overtaking'?

Yes, not very often but it does

1 hour ago, Dylnottheherb said:

Yes, not very often but it does

Can you be more specific, please? 

Ive seen it pick up the 'no overtaking' sign. I've only seen it happen on one road, but it does it every time.

 

There's been other occasions where I've seen its got more than the speed limit but haven't seen actually what sign as it 'hides' behind the speed limit.

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