Check out how much sugar they put into frozen pizza. It’s basically a sweet.

Tbh the math required is pretty similar, I just divide the speed by 2 and am done.

That’s the underlying reason to keep distance ofc. The rule of thumb gives you an easy to calculate solution to how far that approximately is.

The simplified distance rule we learn in europe is: half your speed (km/h) in meters or as an equation, v/2000. E.g. you drive 120km/h, keep 60m distance.