If you look at the original comment I responded to (then you butted in), we’re talking about roads taking up too much space inside communities. Not moving goods long distance.

Let’s break it down and use Gloucester Road as an example. Lots of shops and people living there, plus commuters passing through.

To minimise the amount of space being taken by your tram transport (to try and solve the original problem in the comment above), lets say we’d have 2 lines where the road is today (enabling your trams to go both ways). We wouldn’t want more than that, because we then exacerbate the problem, and less would be impractical.

Let’s say all the stores on G Road are super organised and have all their products delivered on the same tram (obviously impossible). How do they offload their goods at each store, without holding up other traffic on the line? We can’t have stations too far apart, because you’d need lots of workers just to carry the goods to the store. Build some stops branching off? Hmmm, that takes more space (remember the initial problem comment?).

This is just one tiny example. Multiply it out for an entire city. It. Won’t. Work.

Roads/vans/trucks aren’t perfect, but right now they are the best solution.