Škoda DuoBell: A bicycle bell that outsmarts even smart headphones - Škoda Storyboard

Pedestrians wearing headphones are exposed to an increased risk of accidents. In an effort to reduce collisions with cyclists, Škoda Auto, in collaboration with scientists, introduces an innovative bicycle bell whose sound can penetrate even active noise cancellation systems. In doing so, it helps prevent injuries to both pedestrians and cyclists.

Škoda Storyboard

Draw a line, say this is for bicycles, pedestrians and cars have no business here, and bikes have no business being on any other lane as long as these exist.

When bikes have to go through areas where people walk freely, they need to limit their speed to a walking pace.

People should not wear headphones (noise-cancelling or not) when going through traffic as pedestrians. Take them off when crossing!

People should not hear loud music when driving - max is normal speaking voice level. Bike drivers should never hear any music, let alone wearing headphones. Behind-ear speakers on low could be a compromise.

Hey, we just solved 90% of the accidents.

Unfortunately, the UK seems almost incapable of building usable cycle infrastructure (possibly excepting London). Your idea is just a recipe for magic protective paint and even more abuse of cyclists who don't want to be forced to use ridiculously badly designed infrastructure. e.g. Here in Bristol, we have an infamous shared cycle/pedestrian pavement along Coronation Rd that has a few trees completely blocking the cycle side which just means conflict between pedestrians and cyclists who have to fight over the scraps left over from motorists taking most of the space (https://www.google.com/maps/@51.4462522,-2.6064792,3a,75y,80...).
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Sorry I didn't write "don't have trees in the middle of the cycling lanes", I should have been more clear.

Also "don't let the restaurants cover the pavement with tables" follows the same logic.

Perhaps, planners should travel the route three times for every permitted mode of transportation, including walking, biking, and driving.