Which country is this?

Path speed limits of 15mph(24km) are common in Chicagoland, but that is because it is a multi-use path with walkers, runners, dogs, strollers, children, etc.

It is to discourage road cyclists from using the path. If I fear the nearby road is hostile I will hop on the path for short periods, but otherwise I avoid the paths as recreational cyclists wander randomly across the path. Dog owners have extendable leashes which would surely kill one or both of us in a tangling, etc.

The only on-road restrictions I see are single-file riding signs in certain suburbs that get obnoxious pack riders. Since I ride 99% solo it doesn't bother me in the least. Those same suburbs also station cops on weekends to catch cyclists blowing completely un-trafficked stop signs. It doesn't affect me, not because I don't blow stops, but that I know my surroundings. I know where I have to be more cautious.

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Swim - Bike - Run the rest is just clothing changes.

In the US cities, towns, and neighborhoods are just laid out different. From visiting abroad several times for work, sometimes there is a set of only a few narrow streets through towns abroad. In the US, it is "sprawl".

However, it is VERY common in suburban living in the US to have large areas of neighborhood (tens of thousands of residents) where the streets in that area have vehicular speed limits of 25 or even 20mph. My neighborhood does.

Now, given the sprawl, there is no good place for police to ticket people unless a specific busier street has a problem. So, it is what it is.

But I live in N Hills in Raleigh and most streets here are 25mph limit. I can break that easy down the steeper hills here. But, houses are sprawled out so there never is a person like tighter Euro style towns.

Haha. Wout Van Aert would have to ride around with a fat bike, pulling a parachute with bagging clothing to get a workout in your country!!!

20km/hr on Calgary pathways. Banff-Canmore legacy trail which is 20km of pristine pavement with no intersections through the mountains has orange 20km/hr signs, not sure if they are enforceable. Very ironic considering that pretty much all of the users who drive to these trails speed, roll stop signs, run red lights in their cars on the way to these trails.

Romania and the rule is not referrign to bike paths.

The SoCal suburbs are opposite of that. Many of the arterial streets have speed limits of 55-65 mph. Very common streets for cyclists to ride as well.
In my county the regional parks and trails post a 10mph bike speed limit, which no one follows.

A 30kph total speed limit for cyclists nationwide is just ridiculous.

Hmm, cyclists not given priority? So in Romania cyclists always have the right of way, regardless of signs?.
Interesting. Must be paradise.

And do people not go over the speed limit in Romania?

In other countries the speed limit and traffic signs are just a suggestion (unless the police is around).
I have heard it's the same in Romania.

And Yes, 6ft is close to 1.5m, which is pretty universal in Europe.
Here in the US you are blessed if you are given 3ft (less than 1m).
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Wouldn't such a rule be unenforceable anyway? All cars are required to have a functioning speedometer, thus speed limits and enforcement makes sense. With bikes however, most don't have a bike computer with speed (yes this even includes many serious road cyclists). To be honest, there are times when my speed sensor battery dies and I don't feel compelled to replace it. Now if my power meter battery was low, that is a different story. How can you possibly enforce a law that is impossible for the participants to know if they are abiding or breaking the law?