On the same subject, but a different topic - how can bus lanes be eco-friendly? How can it be greener to have one complete lane left empty for 98% of the time, while right alongside it, cars are queueing for ages, with their engines running? Idling cars cause more pollution than those that are moving. They should instead be looking to speed up ALL traffic.
Take the bottle neck on Newport Road, between the old library and Roath Court funeral home. There are three lanes there - why not have a traffic light system, like they do on North Road, so that when the traffic is busy in the rush hour, they can have two lanes going one way (and one the other). But no, instead, we have a bus lane that is not only empty for most of the time, but it only works in one direction.
They should also make all of Penarth Road a clearway, so there are two lanes clear in both directions all the way from Penarth to Cardiff Central station. The part just after the bridge over the river, going into Grangetown, is a real bottle-neck.
Sadly it's all quite deliberate, and the motorist is taking the brunt of the Government efforts to reduce CO2 emissions. When in fact, cars only contribute around 7%.