Living in European cities with multimodal transportations, what I fear the most are cyclists. Cars drive on very clearly delimited space, respect the driving code quite properly and are visible and audible from far away.

Bicycles on the other hands drive fast, both on road and pedestrian ways with a sense of entitlement that they somehow have priority over pedestrians. They are also harder to spot. My worst fear when walking in the city are those Uber Eats guys riding huge electrical bike and going as fast as possible. An impact with that is a sure way to hospital if not worse.