Good, we are making progress .
How about your 60 km/h plus the oncoming 60 km/h = 120 Km/h? Still not worth the wear a belt?

How do you do that anyway? In town one easily goes slightly above and below 60 km/h. Do you then constantly buckle up and out or hit the brakes once you reached over 60? And then make people like me wonder why people brake for no reason at all with nobody in front of them.