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> Why is it ever different between winter and summer?

Harsh conditions + dark winter means that we have lower max limits in the winter. (i.e. 120km/h -> 100km/h, 100 -> 80)

The signs are pretty obvious to humans, though: https://moottori.fi/wp-content/uploads/2017/04/muuttuva-nope...

I wish we had those in Michigan. Too many people don't understand that speed limits shouldn't be considered minimums regardless of road conditions.

Same sign in Spain, when the road is congested the limit goes down.

I'd like to see some dynamic "no passing" zones on multi-lane highways, to tell people to stop trying to change lanes every fifty feet when neither lane is moving.

I remember when the CHP used to do rolling traffic breaks in Los Angeles. The officer would flip on the lights and use the PA to tell everyone to stay in their lane and not try to pass. They’d slowly accelerate to 20mph, and it worked beautifully for turning stop and go traffic into consistent flow. Unfortunately, few drivers think about what they’re doing enough to learn that lesson and it’s very labor intensive (and probably not what the officers want to do).

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