I'm curious to where a tram in Canterbury would go, because at the moment for that city, one small accident causes chaos (I know this because I used to work in Canterbury - and it happened a lot), so where would a tram fit?
I can only assume that this is a vanity project. Yes, there is congestion in Canterbury. mainly along the Sturry Road and Wincheap because there are the 'out-of-town' retail outlets are (two retail parks along Sturry Road, one near the A2 at the end of Wincheap) but, as has been said, a lot of the problem is through traffic. With the exception of the A2 roads from the coastal towns, Thanet, Sandwich and the myriad villages converge on Canterbury. which still has city walls and narrow lanes. Sturry Road has a bus lane, inbound only, a tram would require a further lane to be used, reducing road traffic to be single file. There are places where the road could be widened but not along the whole length without the destruction of property. The plan would presumably involve the replacement of the Park and Ride buses but, once out of peak hours, they are almost empty; I happily use my old person's pass on them when going to the retail outlets knowing that I am guaranteed a seat right near the front and very little delay. There are also at least 11 buses an hour from different destinations, if the plan is to disgorge them at the Park and Ride stop and make them get on the tram, people will simply stop shopping in Canterbury. Otherwise, more congestion.
Another congestion point is the roundabout where the ring road meets Wincheap - including the road under the railway near Canterbury East station, again difficult to widen the road. Wincheap itself is narrow (no more than 3 lanes), old fashioned road with houses and shops on both sides. It is no real distance, I have walked to the retail park on more than one occasion. Again there is a Park and Ride which is massively underused in off-peak. The road is used by commercial vehicles wanting to get on to the A2.
If there was a branch to the University of Kent (out of town) this would bring in more passengers but you're still stuck with a small system and microfleet.
It would compete with Stagecoach's Unibuses which operate Monday - Saturday during the night as well as day and serve residential areas where students live. How practical it would be to direct trams round a housing estate, or, indeed, up St Thomas's Hill to get to the University I don't know. (I would be interested to know about the performance of trams on hills, the only ones I have experienced have been on relatively flat terrain).
Interestingly, Councillor Fitter-Harding lost his seat in the 2019 council elections but was parachuted into a safe seat following the death of a councillor. He managed to turn a 700+ majority into a 160 majority with the LibDem increasing their vote by a couple of hundred. He has previously had another bright idea - remove the market stalls from the city centre (which included craft stalls, some from students) and replace them with a tree lined boulevard. Will that really encourage people to shop in the city centre - just what I want to see when I go shopping, a tree (probably vandalised). How much support he will get from the coastal communities and rural villages (who provide the majority of Conservative councillors) I am not sure.