The point is that we could have a tier system, higher for good weather and lower for bad and I totally agree with the slower limits for foggy weather, I drove trucks for years and have seen way more than my fair share of horrendous accidents in the fog, not all due to speeding but I can’t help but think they would have been far less severe with a low limit in force, I can do without ever seeing another pile of dead bodies on a dark foggy morning.