kono michi wa mijikaku, shikamo anzen desu.

This road is short and, moreover, safe.

Breakdown of kono michi wa mijikaku, shikamo anzen desu.

• は: topic particle
• です: to be
• この: this
• 道みち: road

Questions & Answers about kono michi wa mijikaku, shikamo anzen desu.

Why does 短い become 短く here?

短い is an い-adjective. When an い-adjective connects to another description, its final い can change to く.

So:

• 短い道 = a short road
• 道は短く、安全です = the road is short, and safe

In this sentence, 短く links 短い to the next predicate, 安全です.

A very common alternative is 短くて:

• この道は短くて、安全です。

That sounds a bit more conversational.
The 短く、しかも安全です pattern feels a little more written or carefully stated.

What does しかも mean here?

しかも means something like:

• moreover
• furthermore
• what’s more
• on top of that

It does more than just add another fact. It often adds a second point that strengthens the statement.

So the sentence is not just saying:

• This road is short and safe.

It is more like:

• This road is short, and what’s more, it’s safe.

That extra nuance is why しかも is useful here.

Why is it 安全です and not 安全なです?