If the speed limit is 120, I have to drive 132 according to my speedo to actually reach that. Add a 3 km reduction for the radar guns and I can do 135 on my speedo and still be within legal limits. Further, a ticket for speeding up to 10 km/h is cheap, while it gets expensive from 10 km/h upwards. So, I like driving around 135 on my speedo if the legal limit is 120.
When overtaking on two-lane roads (one for each direction), I think you should do it as fast as possible, no matter the speed limit. The shorter you're on the other side, the better. I drove a long stretch of such a road for years, and I saw lots of near-accidents: someone overtakes slowly, and the car on the other side bound for a collision only flashes the lights instead of slowing down. Because they know they are legally in the clear. And a few times each week, I had to steer around the bits and pieces of such a collision.
Also, in my experience a lot of people tend to drive on the left side of the road on a multi-lane road, simply because they have to turn left in about five kilometers or so.
When overtaking on two-lane roads (one for each direction), I think you should do it as fast as possible, no matter the speed limit. The shorter you're on the other side, the better. I drove a long stretch of such a road for years, and I saw lots of near-accidents: someone overtakes slowly, and the car on the other side bound for a collision only flashes the lights instead of slowing down. Because they know they are legally in the clear. And a few times each week, I had to steer around the bits and pieces of such a collision.
Also, in my experience a lot of people tend to drive on the left side of the road on a multi-lane road, simply because they have to turn left in about five kilometers or so.