Sounds like you are a qualified expert and know more about road design, traffic flow and pedestrian safety than those doing the job now.
Clearly you need to apply for a position so you can right these so obvious wrongs.
Please, don’t pretend you can do the job better than qualified experts
Majority of speed limits are in residential areas set up by the neighbour who complains, as the poster above just proudly did [1]. So the speed starts at 50kph set up by experts when the suburb is created, and 20 years later a random subset of streets is down to 20kph, because somebody somewhere lived there and was bored enough with their life to pester the city hall.
And while that may sound cynical and hostile, it is literally what happened in my last 2 neighbourhoods. There was no expertise, no statistics, no evaluation. Just complaints and no political will to ever refuse or re-examine.
On hwys in my area, experts and studies have repeatedly over years suggested increases are feasible. But it keeps getting delayed. Here's the reality - those who want to go faster will silently go faster. Those who want to go slower will very loudly insist that everybody goes slower. And bureaucratd will be bureaucrats and take the low risk route.
I hate it so much.
We will never have meaningful discussion if we pretend that the only safe speed is 0kph and we all need to stay home and anybody driving is a dangerous maniac. Because if you take the categorical stance that e.g. 40kph is reasonable and all people who want to do 50kph are dangerous drivers who must be stopped, be aware that somebody else thinks 30kph is reasonable and you are a ridiculously dangerous stunt driver for suggesting 40.
It's the old "everybody who drivers slower than me is a moron, everybody who drives faster is a maniac". Have the self awareness that your preferred speed is not the only way to be.
There are many dangerous driving aspects other than going 105kph on a 6 lane straight modern hwy.
In France, some *départements* adopted the 80km/h limitation while some other kept the 90km/h one, this has to deal with a compromise between safety, co2 emissions and current road behavior and population requirements. So maybe for each country, before experts gave roads their current speed limitations, the way the population drove was taken into account by those experts or was taken into account *in place* of experts analysis, in order for the limitations to be a negotiation/compromise between current habits and experts analysis, in the best cases, and only an affirmation of the population *sentiment* in the worst cases.
The problem is not the road experts analysis in EU, but the political decision to apply or not the analysis, and the population refus to follow the limitations.