Traffic related deaths should not be underestimated, they are more common than people think. In fact, so far more civilians have died in car accidents in Ukraine (see https://en.wikipedia.org/wiki/List_of_countries_by_traffic-r...) than in the conflict (using statistics by the UN https://news.un.org/en/story/2022/03/1115042).
Although I personally don't understand the point of this argument. If "only" 40 people die then it's somehow ok but if 1000 die then military action is suddenly justifiable?