On the subject of road island some are really badly designed and expect drivers to change lanes (sometime is quite a short space) as they transit around the island ( and as John Ratsey says you cannot see the lane markings when in heavy traffic, and often as you exit island the lanes all narrow down into one ), others I have used are so well thought out that as long as you get in correct lane when you enter the island the lanes spiral around and you go off at the correct exit.
I think those roundabouts account for 90% of my hooter use these days. Any 'roundabout improvements' these days seem to mean the introduction of this sort of system, sometimes with traffic lights on the roundabout itself, making it even more difficult for those who ignore the road markings.
I hate full time traffic lights on roundabouts - I used to travel to work before 5 am and still the traffic lights on islands by where I live would stop me pretty much all the time, and very often I was the only vehicle on the road WTF ! Also on large islands the lights simply let the traffic go only to be stopped by the next set, the traffic just indexes round one segment at a time and this makes it pretty much impossible to change lanes as you are hemmed in the whole time ( and can't see lane markers anyway). In one stretch of road by us in less than a mile there are 8 sets of lights, and they are not synchronised in any way, you can get through one only to find the next on red, and if you turn off you will probably find another set on red within 50 metres and then the the traffic backs up to the previous lights and stops up the junction. One island was replaced entirely by traffic lights and with the filter lights blocking and releasing various lanes people often see a green light and pull way ( into the path of other traffic ) it is far more dangerous than the Island ever was.
We live in a touristy area by Ironbridge in Shropshire and I am always aware that many drivers may not be local and try to be understanding if cars are in the wrong lanes ( at least if they indicate their intentions, which BMW's never seem to do).