If they don't want us to jaywalk, just put fences up on the border between the footpath and road, and have slots in the fence at the places people can cross.
To avoid people climbing over the fences, make them quite tall. In fact, we could have tunnels. Whole we're at it, might as well get pedestrians to apply for a walking license, registration numbers, and walking-insurance in case you get tripped over by enever pavement blocks.
The lighthearted bit: just have conveyor belts to ferry people around like at some airport terminals. Then people don't even have tobwalk. They can just stand still and continue looking downwards and use their mobile phones and other music players.
Damn it why can't I be lighthearted about by this stuff. I gotta loosen up. Imbgoing for a (jay)walk.
Edit: corrected typo