How to understand the ups and downs in the signal

Hello,
I have a speed signal and I want to find its ups and downs. How could I find the indexes of the signal where it behave like increasing or decreasing?
For example, on this picture. There is a pink signal. Its my speed and I want to find the indexes of the signal where I emphasize the red circle. There has been a drop in about 1 km/h. I dont want to get the smaller values significant.
Yasemin Barutçu
Electrical And Electronics Engineer

Ok. I uploaded an example of my speed signal. There has been 3 point where I emphasized with the red circle. I pointed these places because there have been drop in 10km/h changes. The others smaller than 10. I want to find the start index and the final index of these 3 places.
Yasemin Barutçu
Electrical And Electronics Engineer
Attachments:
Speed.zip ‏329 KB

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