[avhon1]

I think speed limits have informally (and unevenly) been rising to match the capabilities of new cars and roads. I visited a new area recently, and was shocked to see that traffic was flowing at 90 mph (!) in a 70 mph zone.

I was glad I wasn't driving, because not only is that a greater posted-vs-actual speed difference than I've seen before, but I've never actually driven that fast in my life. I'd have been torn between driving 80 in the right lane and being constantly passed at 10-15mph, or being white-knuckled behind some other vehicle and setting a personal landspeed record.

[throwaway0a5e]

Safe traffic speed is a tautology since (at least per current civil engineering doctrine) speed limits are based on the Xth percentile (where X is usually somewhere in the 75-90 range).

Speed limits themselves only have a passing correlation to safe traffic speed. Almost nobody actually follows them intentionally at scale (traffic just moves at the maximum safe speed which just sometimes happens to be at or below the posted limit) which is why most municipalities are abandoning the "slap a sign with a low number on it" approach for "traffic calming" road features. Traffic moves at what it considered to be the highest safe speed for the conditions (a bunch of factors too long to list). You're seeing high differences because there's many roads that have speed limits that are unrealistically low for light traffic conditions (often below the designed speed of the road) and traffic density (as opposed to visibly or a sharp curve) was the road condition that was the bottleneck on speed on most busy roads. 'Rona has widened that bottleneck so of course you're seeing bigger differences between the posted limits and the traffic speed on those roads (which is probably all roads if you only ever drive during daytime hours in urban areas).

Edit: kind of got off on a tangent there but the point I should have made is that speed limits are fixed whereas traffic speed is variable based on conditions. As conditions change both slowly over time and day to day/hour to hour the max safe traffic speed changes. With 'Rona chopping congestion across the board it's no surprise that you see traffic speeds much farther from the speed limit on roads where traffic volume was a big factor in the traffic speed.

[clarry]

Maybe they have in some areas.

In my case, rural Finland, it's been the same for as long as I remember. Maximum limit is 120 km/h on freeways (and there are practically none of them where I usually drive), elsewhere on bigger inter-city roads it's 100 km/h during summer and 80 km/h during winter. Lesser roads, never more than 80 km/h.

And traffic never flows significantly faster than the limit. A few km/h over the limit at most. There are some weirdos who drive much faster and are constantly overtaking others, but relatively few people drive like that. If anything, it seems to me that speeding has become less common over the years as the police have tightened the limit at which they'll fine you.

[TomMarius]

I am from the Czech Republic. Left lane on highway is informally reserved for "going fast", as in 160-200+ km/h. Right lane is around 120-140 km/h. Oficial speed limit is 130 km/h. Regional roads are limited to 90 km/h, but people travel as fast as 160 km/h on the largest ones. Town areas are limited to 50 km/h unless said otherwise and it required automated radars to get drivers to go less than 90 km/h in many towns on major roads.

People are basically behaving like it's German autobahn everywhere. Even the informal rules have adjusted - in a major city, you not only respect the right hand rule, but also give right of way to all vehicles on the more major road. The conflict is resolved by blinking headlights.

Honda used to be the most popular brand here (90's and first few years of 00's).