The implication is that when something bad happens, only then one will see the results. Is there a semantically identical idiom in English? Can this idiom be considered as an equivalent to the above-mentioned one ? - Shut the stable door after the horse has bolted ?
It appears that the proverb warns one to not wait until an unfortunate incident to see the results helplessly (the "harsh" reality of the "road" after the cart has overturned) but be prepared to prevent it (make sure the cart is moving smoothly by "driving" it gently, maintaining it in a good state of repair, etc). In that sense, a good English counterpart may be "Foresight is better than hindsight".
Foresight is better than hindsight.
cliché It is better to anticipate and prevent future problems than to realize how they could have been avoided after the fact.
If I were you, I would pay the extra $50 for full insurance coverage while you're traveling. You never know what might happen, and foresight is better than hindsight.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
The closest thing that I can think of would be the fairly common expression in English hindsight is 20/20:
In hindsight, things that are obvious now were not obvious from the outset; one is able to evaluate past choices more clearly than at the time of the choice.
Quite obviously, it's not the exact equivalent, but conceptually the two expressions are really more or less the same. To get a better idea how this idiom works, take a look at this example:
With 20/20 hindsight, it's now obvious that we should not have trusted this charlatan from the very beginning! He cheated us out of all our money!
a rude awakening TFD
The shocking instance of learning the unpleasant or unwelcome truth about a situation.
You don't know what you have until you've lost it.
Don't know what you got till it's gone
Don't know what it is I did so wrong
The Free Dictionary says:
It is possible for something good to come out of a bad situation. (A silver lining on a cloud is an indication that the sun is behind it.)
Consider the following quote:
Good decisions come from experience, and experience comes from bad decisions - attributed to Mark Twain at AZ Quotes
The experience resulting from bad decisions parallels your idiom's overturned cart, and the experience leading to good decisions parallels your idiom's road.