First of all: there are loopholes in the law, but it is not up to you to decide whether there is a motive for killing. The key depends on evidence and criminal behavior. If you hit someone, you can be sentenced to death directly That's what Comrade Yao Jiaxin did, and later he died.
Secondly, if you are really awesome and do things without leaving a trace, it is another matter, but this is not a loophole in the law, but your anti-investigation ability is high and your current investigation technology is not enough. More importantly, it may be that the evidence is not enough to convict you of intentional homicide, and you can only be convicted of traffic accidents. I think a few people in reality can be perfect in the face of high technology. It is out of the question. If you want to be unknown, you must do it yourself.
Finally, the death penalty for traffic accidents is not light. If your social harm is very bad, you can be given a heavier sentence. Moreover, the victim can file criminal incidental civil compensation. If you want to pay for nothing, there will be no public anger and the law will not be here. You should always balance your personal interests more or less.