Learn Croatian: Umor može dovesti do nesreće. - Tiredness can lead to an accident.

Because it follows the preposition do, which strictly requires the genitive case. The phrase for 'to lead to' or 'to result in' is always dovesti do followed by the genitive, even though the English translation feels like it might take a direct object.

The verb dovesti means 'to bring' or 'to lead'. Why use it here for an abstract concept like an accident?

While dovesti is often used for physically leading a person or vehicle to a location, the structure dovesti do is the standard way to express causation or 'resulting in' something abstract. It closely mirrors the English metaphorical phrase 'to lead to'.

Could I use the imperfective verb dovoditi instead of the perfective dovesti in this sentence?

Yes, but the nuance shifts slightly. The perfective dovesti focuses on the risk of a single, complete event happening. If you used the imperfective dovoditi, it would sound more like a continuous or recurring general rule, implying that tiredness repeatedly leads to accidents over time.