That part also exists in Germany. The 100kph on the "Landstrasse" - which does not mean two lane highway, it could simply be the road connecting two small towns that doesn't look much different from the road in town except for no houses on either side - only applies to cars. Trucks have an automatic limit of 80kph. That is sooo dumb! Lots and lots of accidents because cars get stuck behind trucks and get aggravated. Especially on one lane ones that have enough traffic to make passing almost impossible. And since this is Germany, most of these aren't straight like you might expect from the US. These are usually very meandering, which makes it real hard to pass those trucks.

And never mind the actual highways, where there's no speed limit unless posted. And trucks still can only go 80kph. So you have 2 lane Autobahn. Trucks at 80-99kph on the right lane. 90-200kph cars on the left lane. The trucks that go 80 will have a bunch of trucks that want to go 90 trying to pass them. Then add the ups and downs where even the 90kph truck that's passing will slow to 75. Even if you're only cruising at 150kph (actually a pretty nice cruising speed), if you come up on an "elephant race" as they call it behind a bend in the road it's not fun. This extends to 3 lane highways too. Just that now you actually have cars switching from the middle lane to the left lane, because one truck is passing another. So you have an 80kph truck on the right, 90kph truck on the middle lane and a 100kph car in the left lane and the 200kph Mercedes or BMW approaching from the rear.

Truck have a massively higher kinetic energy. Therefore they have different regulations. I really wouldn't want trucks driving around with 130km/h (let's not even speak about the environmental impact). The big issue with trucks in Germany is that Germany is a transit country and with just in time delivery freight trafic on the roads increased massively. So there are many more trucks on the road than originally planned for.

The weird thing is that in Germany you have these competing speeds that make driving worse for everyone. That 20kph difference is responsible for a lot of bad behavior on smaller roads. On the Autobahn the differences are even bigger, even if there's more space (a second lane) but then like you mentioned there is a lot of traffic.

In the US and Canada for example the speed limit is just the same. Everyone goes at 100kph in Canada, truck or no truck. While you have people speeding there as well obviously, everyone is sort of going at the same speed.

it varies a lot by region in the US.

in NJ, everyone is going about the same speed, but way over the limit. people seem to be pretty good about staying out of the passing lane in light traffic.

in VA, everyone does seem to more or less go the speed limit.

in MD, it's utter chaos. you'll see a minivan going exactly the speed limit in the left lane, people passing it 10-20 mph over the limit, and wild people weaving in and out of exit lanes to pass everyone else at even higher speeds.

that's my experience anyway.

Another major part of the problem is that driving on highways and since 2018 also Bundesstraßen (basically, Landstraßen with regional importance) costs tolls, and truckers try to save toll wherever they can.

> I find the UK's road sign for "National Speed Limit Applies" to be surely one of the worst designed road signs in history.

No its not my friend.

Because it is only telling you something that you should already know if you have passed your Theory Test.

Namely that the National Speed Limit is the default state.

Anyone who has passed the Theory Test will know what the NSL is based on the road they are on and the vehicle they are driving. Its not difficult, you've only got to be able to tell the pretty darn obvious difference between a built-up area, single carriageway, dual carriageway and motorway (and whether a central reservation is present or not).

Which is why you only (typically) find NSL signs:

     - in locations where the context may normally dictate otherwise (e.g. presence of street lights)
     - where temporary limits are changing back to NSL (e.g. after motorway roadworks)

Don't overthink it. Its a lot easier to understand and a lot more sensible than you're making it out to be.

Right, but not all drivers operating a vehicle in the UK are required to pass a UK driving theory test. Virtually all foreign drivers can arrive, show up to a rental car place on their foreign documents and just drive out. While in the best case scenario a driver may have a UK licence and passed a corresponding theory test, this is not guaranteed. There's zero requirement to have sat that test for almost all foreign cars entering the UK via train and ferry too.

As a counter example, a UK person visiting the US would have almost zero difficulty understanding any of the speed signage, as they all incorporate the actual speed limits. Similarly, there is zero expectation you have passed the theory element of a US drivers licence. The US has roads with different speed limits for different vehicles too and still manages to get clear signage with numbers.

Good signage can be clear regardless of any tests, virtually all other speed signage in the UK incorporates a number. Speaking from experience, even those who have sat a theory test can often not really understand that sign or forget its meaning. There's not even any guarantee a licenced UK citizen has ever sat a theory test, given those who gained a UK licence before the introduction of the theory test in 1996 have generally never been required to sit one. The pre 1996 "theory" element was some random questions from your tester during the practical.

The standard of driving in the US is also appalling because its basically seen as a god given right that you should be able to have a driving license, and so minimal barriers are put in place to get one.

I also know many UK peeps who learnt to drive before 1996 and never have I heard one of them bitch and moan about "how stupid the NSL sign is".

We all know the US is a bit of a nanny state and everyone is constantly covering their backsides to avoid getting sued, and that's probably why the US has explicit speed limit signs splattered at every opportunity. Because if the US had the NSL system, some smart-alec would have a crash and then open up a lawsuit because they were too dumb to figure out which of the four types of road they were on.

I'm sorry. I'll happily bitch and moan about other aspects of UK roads (e.g. not-so-smart motorways). But NSL ? Nah mate ... it makes sense and you know it. ;-)

As you can see from this link, most European countries use the "NSL" sign in some form. It's expected that drivers find what those limits are when they cross a border. There are signs at all land borders showing the limit, also on that page.

https://en.wikipedia.org/wiki/Comparison_of_European_road_si...

> Rather than put a number on a sign and be done with it, its an inexplicable white circle with a black line across it! > […] > it depends on […] what you are driving.

If it depends on what you’re driving they can’t put a single number on it. I would guess putting multiple numbers on wouldn’t be an improvement.

The USA sometimes has this on freeways where you’ll see a large 70 and below it TRUCKS 55.

Most other classes aren’t listed.

Likely the German way is better as the real law everywhere is “do not drive faster than is safe for conditions” but that is a number that changes day to day.

It just means speed limits are passed by reference rather than by value.

The sign has that design because it used to mean the end of the speed limit - you'll also hear it referred to as "deristricted" although that hasn't been accurate for many years. Rather than spend a vast amount of money replacing the signs and potentially also missing some and resulting in driver confusion, the National Speed Limit was introduced.