...If there's no other car or other obstructions on the road/highway why not drive as fast as 1) The road conditions allow 2) You are comfortable going 3) The condition of your car allows. When you finally encounter a car reduce your speed to around theirs and continue in safety.
Sorry, I gotta chime in here. This is absolute nonsense. All 3 of your "checks" have one major flaw...they are all dependent on the judgement of the driver. If the person driving the car is an irresponsible dare devil who thinks he's a god behind the wheel when in fact he's an inexperienced asshat he may feel very comfortable driving at 180km/h in the middle of a blizzard with worn out winter tires. The rest of the people sharing the road with this person would be at risk because of his poor judgement.
I never understand these posts where people complain about the police doing their job when it comes to traffic violations. I have a great idea...don't drive like a moron and you'll all have nothing to worry about!