It’s annoying enough that roads are sprayed with salt every winter. All the more irritating when the gritting vehicles throw handfuls of corrosive sharp stuff straight at oncoming vehicles.
Today’s invention is therefore a good application for autonomous vehicles.
A salt sprayer truck (blue) drives along and sprays only directly underneath itself. No more having my paint shot peened as I drive behind or towards the gritter.
Since it makes sense to salt both carriageways at the same time, the gritter truck would detect oncoming vehicles and only spray within the pink oval when no other cars were within it.
The sprayer truck would need to slow and speed up to ensure road coverage, whilst also avoiding oncoming cars, but since it would be robotic, this could be achieved with great precision and a high average speed.