List of random incidents I have witnessed personally as a road user;
Pedestrian stepping/falling off kerb into traffic causing evasive action.
Missed red lights.
Missed pedestrian crossing lights.
Out of control wildlife on road - deer/rabbits/dogs/sheep/horse/cat
Brake fail on wet road
Brake fail on hill.
Tyre blowout on downhill corner.
Rockfall from hill above onto road below.
Cyclist wedged between two buses.
Parked car door opening into traffic.
Road debris.
Roundabout exit confusion.
Lane skipping/junction confusion.
HGV/Bus not being given double lane turn space.
Brake/accelerator confusion rear shunt.
Snow/ice/wind/low sun effects.
Emergency vehicles not being noticed.
Stones/snowballs thrown.
Traffic on wrong side of road/junction/1 way system.
Load spillage.