Someone selling ice cream is a hazard clue. Children may be nearby and may not see you. Drivers changing a tire or fixing an engine often do not pay attention to the danger that roadway traffic is to them. They are often careless. Jacked up wheels or raised hoods are hazard clues.
Accidents are particularly hazardous.
People involved in the accident may not look for traffic. Passing drivers tend to look at the accident. People often run across the road without looking. Vehicles may slow or stop suddenly. People in and around shopping areas are often not watching traffic because they are looking for stores or looking into store windows.