Alternative proposal: ban cars from the city centre, put in good sized park and rides with proper transport links, no more congestion.
Glasgow has a massive advantage in doing this: the M8. Put a massive multi-storey car park at each exit, and bus gate the roads past them into the city centre. It's then really easy to drive
to the city centre, but almost impossible to drive
into it. The city centre is then walkable from the car parks for most people. Most of the natural City Centre access points sit astride bus routes anyway, so existing bus services could easily take passengers unable or unwilling to walk.
With the cars removed from the City Centre bus services can become more reliable. The other thing that would make a huge difference would be replacing the car parking down both sides of our lovely wide streets with proper cycle tracks. This could be done quite easily in most places, except for Great Western Road.
There's a screaming need for something to take the through
road traffic between Clydebank or so and the M8 off of Great Western Road. That longer-distance traffic to and from places beyond Glasgow isn't going away any time soon, and keeping it on city streets both slows it down and causes problems for local traffic.
Trams are lovely, but they'd be a long way down my list of ways to improve transport in Glasgow. Ironically, I think someone in the Council actually has a pretty good idea of what needs doing. There has been a lot of sense come out of them lately. It just takes a long time for them to translate good ideas into action.