Waze does love the M6 Toll and with good reason. It's at least 10-20% quicker than the M1 or M6, mainly because you have to pay for it.
If you can give us a rough start and end point, and the route you think Waze should take you, we can have a look and see if there are any map problems causing this.
FYI, you'd have got a quicker response from someone in the UK if you had posted in the UK subforum
Oh, waze does indeed use smaller roads, better than other SatNav apps I find, but the map must be correct, etc.
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Funnily enough it was traffic apocalypse on the M6 tonight, as seems to happen quite often now. Waze as usual wanted to get me onto the M6 Toll and then M6, despite there being a SIX HOUR delay. (yes, 6 hours) It offered no alternatives. (I'm not making this up, I promise)
I fired up Co-Pilot and it routed me onto the A34 and got me home in just under 2 hours. Slow, but rather better than 6 hours. I repeatedly tried Waze when on the M6 Toll to see if it knew the A34 existed, just out of curiosity. It failed every time, and only offered me a single route option - the M6, which was closed, and Waze knew it was a disaster as it reported an average speed of 2mph for many miles.
Getting back to the route I was talking about in my original post, these aren't my exact start and end points, but they'll give you the right idea.
This is the route Waze always wants to use to take me home - https://maps.google.co.uk/maps?saddr=B4 ... via=1&z=11
On a Friday evening, the M42 is car park, as is the M6. It's a really, really, really terrible route. The alternatives it offers me are - https://maps.google.co.uk/maps?saddr=B4 ... ra=ls&z=10
This one is even worse!
And this one - https://maps.google.co.uk/maps?saddr=B4 ... a=1,2&z=11
This is also dreadful. The first of these three, on a Friday evening, would get me home in about 3 hours. The second would be more like 3 1/2 hours, and the third, also around 3 hours.
Compare this to co-pilot, which comes up with this route - https://maps.google.co.uk/maps?saddr=B4 ... 3,4,5&z=12
It knows to avoid the heavy traffic on the A46 in south Coventry, it knows to avoid the M42 as best it can, and it avoids the M6 completely. It uses the toll of course, but if I don't want to pay up it will give me this route instead - https://maps.google.co.uk/maps?saddr=B4 ... 3,4,5&z=11
It's a bit slower, but there's no toll involved.
This is just on Friday evening. At other times Co-Pilot will give me the same routes as Waze does, but as I've said, on Friday evening the usual routes are a disaster zone.
It really looks to me as if Waze just doesn't know the A34 or the A446 exist, as it will never offer them as valid routes, even when the alternatives have truly epic delays.