Sometimes, even the creator, which is me in this case, can't solve one's own problems. So I will post my problems here, we will discuss the answers to the problem. And when the answer is revealed, I will quickly delete this discussion and post the problem for everyone to solve.

"But doesn't that everyone know the answer when the problem is posted? Even the explanations are understood by everyone."

"Well, I haven't thought of that. At least, you gain those things from the discussion."

The problem for this time is:

We have assemblies every Monday at the schoolyard. And it is boring, but because there mustn't be anything from the principle that is left out so I have to pay attention to every word she says. I usually look down to the ground. There are tiles laid down the ground. I imagine there is a city, a miniature one, with the population filled with ants. (I kill them at the end anyway. I have a lot of regrets after doing that.) The tile looks like the figure below.

What is the minimum amount of 90-degree turns that have to be made for one to go through all of the roadways in the map above?

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