"Making dangerous appeared roads is a good way to decrease traffic accidents."

"Making the roads appear dangerous is a good way to decrease traffic accidents."

Which is better? Or are both not good?
Note:
These sentences are based on the fact.
A town has intensely made their road appear dangerous, then the traffic accidents began to decrease there. この表現は自然ですか？

Out of the two, the second example is the most natural as the first one doesn't make sense.

I would change the sentence slightly as the way you out it makes it seem as though intentionally making the road appear dangerous is a good thing, irregardless of traffic. So I would put it as,

"Making the roads appear (more) dangerous (than they actually are) is a good way to decrease traffic accidents."

The last sentence is also quite unnatural. You put,

"A town has intensely made their road appear dangerous, then the traffic accidents began to decrease there"

I'm not too sure what you mean by 'intensely' but I'm guessing you mean the town has enforced the new methods quite quickly, or if I'm wrong, please let me know.

Because of this, I would write the sentence as so,

"A town that enforced a new method of control on their roads, by making them appear more dangerous than they actually are, has seen a decrease in vehicular traffic accidents."

It now flows a lot better and also makes sense when read, unlike the previous example.

I hope this helps! 👍🏼