A4161: Wellington Street to B4487, Newport Road; St Mellons roundabout
A48: Slip roads to UHW and A&E department
Source: Cardiff council
These included the Culverhouse Cross roundabout and the slip roads to the University Hospital of Wales.
People travelling by public transport are urged to check their operators' website for information.
Arriva Trains Wales said services on many routes were being disrupted and it strongly advised passengers not to travel on routes on Thursday evening where buses were planned to replace the train service due to engineering work.
It said: "At short notice the bus services may not be able to operate if roads become impassable due to the inclement weather."
First Great Western has suspended Cardiff to London Paddington services at 55 minutes past the hour and Paddington to Cardiff services at 15 minutes past the hour.
However, all services between London Paddington to and from Swansea are operating normally.
The assembly government said it was giving extra supplies of gritting salt to some local authorities as many report their supplies are under pressures after days of round-the-clock salting to keep main routes open.
Deputy First Minister Ieuan Wyn Jones said the assembly government had been working with local authorities over the past 12 months to ensure a "significant increase" in salt stock levels over last year.
He said: "In addition to providing some local authorities with additional salt supplies, we are liaising with suppliers to assist in the prioritisation of deliveries to local authorities."
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