We have a dual carriageway, 60 limit, that goes over the Thames towards the M4. A while back the Council widened it a bit to make it into two lanes each way, although the lanes are quite narrow. They also put in a cycling lane on the "safe" side of the barriers, which no-one uses.
Driving along it you have to keep a lookout for very low flying swans over the bridge, then all of a sudden the car in front swerves into the outside lane to miss a group of cyclists riding two abreast. Cars swerve in succession as you can't see the cyclists until the car in front clears them. IMO it is a very dangerous situation with the narrow lanes and the speed limit.
Us regulars on that road keep extra car lengths distance because if another vehicle is alongside you have nowhere to swerve.
On the big roundabouts they change lane without so much as a glance, let alone a signal. If we see one with a rear light at night it is cause for a cheer. Traffic lights do not apply to cyclists, and when they zoom up on the inside of lorries approaching lights it makes me wince. They appear entitled to swerve out to miss potholes without warning. I am surprised no one has been killed.