Blast-resistant bins have been developed which seem to me to be massively costly and probably not very effective.
Today’s invention is an alternative, inspired by a scene in the film Speed.
A solid steel box with a sprung lid is attached to a large cage.
The whole system is bolted to the surround of a manhole cover, once the cage has been inserted into this, as shown.
Any rubbish thrown in ends up in the cage in the drain or conduit. The bins are extracted and cleaned each night, when crowd density is zero.
This means that nothing deposited will ever be above ground level, so that if a bomb is dropped in, it will detonate below ground, sending blast waves along the pipe in both directions (as well as vertically), thus causing minimal injuries/damage within the street.