Every municipality has a minimum speed limit so you can’t just have someone driving 1km/h down the road creating a rolling blockade. Most are posted on the entrance into the municipality.
There are reasons for both sides to have and not have specific laws.
I’m a traffic engineer and I’ve literally never heard of such a thing (except on freeways).
In Georgia it’s illegal to travel 15 or more under the posted speed limit, including on non interstate roads, unless otherwise posted.
Edit: getting downvoted for saying facts about my state. Yall are weird
In Sweden it can be illegal to drive too slowly. You’re not allow to hinder trafic and should follow the speed limit. At the same time we have tractors and vehicles that are only allowed to drive in 30km/h but they require a special sign on the back to signal to other people that it’s a slowly moving vehicle.
It’s however incredibly rare that anyone gets a ticket for driving too slow.
There isn’t a set value. You can see sources below.
Georgia: https://dds.georgia.gov/section-5-continued-keep-right-except-pass
National: https://www.nhtsa.gov/sites/nhtsa.gov/files/summary_state_speed_laws_12th_edition_811769.pdf
Where are these municipalities?
These are US signs and this isn’t a thing anywhere that I have traveled to across the US other than the 40 minimum on some interstates and highways.
Every municipality has some form of minimum speed law, do you want me to list every single one? You even provide an example of places they are used… and want to argue they don’t exist…? What?
Can you provide an example of a place without any minimum speed laws?
In Kansas, every single street that isn’t a highway, and most highways don’t have minimums.
Outside of Kansas I have never personally seen them posted on anything other than highways either.
I have seen general traffic laws about not impeding traffic by going unreasonably slow, but no posted minimums.
Where I’m from it’s just 20 less than the max. Conditions apply but that’s because they reduce the max
