Poor weather conditions, heavy traffic and reckless driving can all make for risky driving and the increased chance of an accident. (carinsurancequote.net)
You will see more clearly which hugely reduces chances of an accident. (emiledrivingschool.com)
They may be considered hazardous because there's a higher chance of an accident occurring — for example, construction workers — or it's an unhealthy working environment — for example, miners. (quotacy.com)