I'm posting from my experience about a decade ago before I switched to Garmin TA traffic via the cable aerial.
Unfortunately, down here in London, there are always lots of roadworks, which is relevent.
When I last used Smartlink it had a 200 incident buffer. When that buffer filled up you got no more new incidents. On quite a few occasions I joined the M25 at junction 10, clockwise, which Smartlink indicated was clear as it had no yellow or red traffic bars, only to be met with a solid jam.
When I looked further, and counted the incidents, it was always 200. I reckoned a lot to do with this was viaMichelin not removing obsolete roadworks as well. There was a 3 day barrier repair on the M4 that was still showing on viaMichelin 6 months after it finished.
Come 1st July and I have to switch to Smartlink I'm hoping it's improved. I did recently test it on my secondary Garmin and the first thing I noticed was that whilst the M4 smart motorway roadworks are clearly shown on my Garmin DS61 via cable traffic, my Garmin 2599 via Smartlink didn't show them, so I'm not hopeful.
If so, roll on my Jazz and I can use Google Maps via AA.
