This is impossible to achieve since every vehicle has different acceleration and every driver has different response times.

There will always be stop and go traffic once the carrying capacity of the road is reached. Once the capacity of the road is reached, it's actually most beneficial for everyone to be as close to each other as possible, and fill gaps as quickly as possible, since there's a finite amount of road at any given time, so only way to maximize is is to fill up as much if it as possible.

Also why you should use all lanes available and create zipper merge at the very end.