Noise is treated as a rather than as a risk to the heart, and the evidence does not support that.
Long to traffic noise goes with raised blood pressure and heart disease.
The effect works during sleep, when a person does not notice it.
The heart still speeds up for each passing truck, and it does not .
Noise is also distributed along the same lines as every other urban harm.
Cheaper flats face the busy road, and the quiet side costs a higher rent.
Remedies fall into three groups and differ greatly in cost.
Barriers and treat the symptom and are expensive per household.
Surface treatment of the road cuts several at a fraction of that price.
Speed limits are cheapest of all, since noise rises steeply with speed.
A limit of thirty kilometres an hour lowers noise as much as an expensive barrier.
Night are the exception that reverses this logic.
Moving lorries to quiet hours empties the daytime road and ruins the sleep of the street.