The danger are other cars on the road. I've been thinking about creating computer vision tech to spot inattentive drivers, it's something I think motorcyclists could really benefit from (myself included)
I imagine a system in which 'poor driver' tags would decay with time. Data is shared.
Would be neat for self driving cars to update this data in real time, so you could see a data overlay of their decisions and intentions. A long green arrow would show their intended path, icons show you if they have seen you, timers counting down e.g. I'm pulling away in 3, 2, 1 ... now
AR is going to be fun.
And potholes, debris, slick spots, ... the kinds of things that might inconvenience or damage a 4-wheeled vehicle can be deadly to a 2-wheeled vehicle at 60+ mph. Losing control of a car, you might skid, spin, or flip. Rolling a car can be deadly. Losing control of a motorcycle at high speed will almost certainly cause serious injury or death.
You're probably not as good a driver as you think you are. After all, we can't all be above average.
Both my accidents were with HGVs[1], the reality is the danger is everywhere
[1] Only one was their fault, the other entirely mine