You could give your personal opinion: "I think he's drunk!" or you may just comment on what's happening as compared with normal behaviour: "That's really unusual behaviour!" Or, you may just state that this person is 'dangerous' to other people from the safety point of view.
A serious traffic offence whereby the driver of a vehicle disregards the rules of the road, driving very dangerously, causing accidents or other damage.
He is charged with causing death by reckless driving.
A serious traffic offence whereby the driver of a vehicle disregards the rules of the road, driving very dangerously, causing accidents or other damage.
運転手が道交法を無視し、危険運転をし、事故やその他損害を与えた重大な交通違反。
He is charged with causing death by reckless driving.
無謀運転による過失致死で逮捕された。
That driver should pull over as they are a hazard on the road.
This is a way of saying that another driver is not driving cautiously or according to the rules of the road and as a result people need to take notice or be aware of the driver.
南アフリカ 
日本 
カナダ 
イギリス 
