Apparently in Central London as much as 32% of traffic is Uber drivers hoping for a fare!
Surely as Uber drivers are not 'Hackney cabs' they are not permitted to 'ply for hire' so they would be just as well advised to park and conserve their fuel.
Bike lanes only have a chance to reduce congestion if people use them, and then it would need a large increase in cyclist numbers (with a matching decrease in driver numbers)to be effective.
In Cardiff (as elsewhere in the UK)the presence of dedicated cycle lanes does not mean they will be used. Cyclists still use the road or the pavement even where cycle lanes are present.
Cyclists are rarely prosecuted (in my experience) for ignoring the rules of the road.