Forgive me for saying but are these drivers trained in road driving and safety? in such case if they pull out and cause a accident from oncoming traffic on the dual carridgeway then it is there own stupidity which caused the accident.
As for the childrens concern and letter to the pm, that is sweet and I do hope it makes the local council do something about the road.
Sadly with the rat race nation we are today where 20seconds longer seems like a eternity when your in your car, the junction is sadly just too tempting, and for those who either dont have a fast car, or there car is faster then the driver, who dont realise the manover is behond what they are capable of, dont just carry on the long way.
I know whenever I am on the road I always turn left go down the road, around the roundabout and back down the road, I never do a right hand turn into a main road crossing the left hand lane. Too stupid and the risk factor is high. All for 2minutes.